Well, you might like Microsoft's services and thus you're happy with them being offered as default buy I don't want them and AFAIK they can't really be removed from Win 10.

I miss the days where an OS was just a means to run programs, now they're publicity vessels and user data gatherers for the OS makers (this includes Android of course). Now, Win 10 installation procedures tricks you into believing you really need a Ms account to install (the option to use a local account is almost hidden) and MS's services are being pushed you all the time: Cortana, Bing, ... I feel that upgrading to Win 10 from 7 benefits Microsoft much more than me. It shouldn't be surprising since they're actually giving it away.

Of course, Google is also guilty of not giving the user control by not letting uninstall you any of the Google apps that come with Android devices. I totally hate what the OS world is turning into.

Since it seems that mobile is where the growth is. Therefore, if you're not there you'll miss on the millions of users who will use mobile devices as their primary (or only) computing devices. Of course, for commercial software (Windows) that's the difference from making a lot of money or just get much less from only the desktop market. For open source what you risk is irrelevance.
At least I hope, this adapting of Plasma to mobile didn't involve fucking up the UI for desktop use as it happened with Windows 8/10.

I don't think those are the reasons people have stopped using Firefox. As far as I remember people started migrating en masse towars Chrome a long time ago, much earlier than the controversial UI changes and the Pocket stuff. In fact, all the controversial Firefox changes are quite recent.

Nah, these days PC gaming is pretty simple and the only difference you have to take into account when buying a new one over a "regular" PC is that you have to add a decent GPU. It's not a huge cost difference and you have a device that's useful for web browsing, work and gaming.

That's the single reason I'd consider upgrading for. Well, and also support for future standards and hardware.
Microsoft are not stupid, they always keep a huge feature exclusive to the new OS. They also did it with DirectX 10 and Vista

Yep, there aren't any real alternatives to Windows if you want to keep using programs who only exist for Windows.
In my case it's the games and, let's admit it, the fact that you have drivers from the hardware manufacturer that most often work perfectly. You might have luck with Wine but that's about it. As much as I like ReactOS it's a very long way from being a viable Windows replacement. I'm not dissing them: It's a very hard and laborious job. They'd need hundreds of devs to make substantial progress in a short time and OS development is something that requires coding expertise far beyond "hello world".
I really hate how Microsoft are taking away control from the user, how Windows 10 feels like an advertisement for Ms's services (Bing, cortana, OneDrive...), how they push you to use a Microsoft account, how they're turning the OS in a mixture of touch and traditional interfaces (making it ideal for neither).
But I'm stuck with it if I want keep playing my games. It's my fault I guess for putting myself in the hands of a corporation.

Virtual +1 to you since I don't have mod points.
Nadella acknowledges that their strength is in the 90% market share they have on desktops. That's an strangely honest remark for a CEO. But precisely because of that universal apps should ideally have, IMHO, a UI designed specifically for desktops (mouse and keyboard) and another for touch devices, because the current UIs of universal apps are less than ideal for kb+mouse, sure, they technically work, but you have huge target (buttons and touchable elements) sizes and lots of whitespace thus having a low density of information. Also they usually have very few options making them less powerful than traditional PC apps. To sum up, they're esentially mobile apps on PCs and I've no need for them.
Their only redeeming quality is that you'll have the same UI on every form factor, but in this day and age, it would be pretty easy to separate data and logic from UI and have two UIs each specifically designed for touch and kb+mouse.
But hey! all the growth is in mobile devices so who the hell cares about those stupid desktop users who want complex and powerful programs to do things?

Are there different versions of the ST3000DM001? I guess so, cause I'm seeing several listings of, apparently, that very same model, on the same shop as different "models", with slightly different prices. (I hope I explained myself here)
I also wonder if the newer ones are any more reliable.
Thanks

I updated the Windows 10 preview to the last build and saw an icon that looked very much like that of Internet Explorer. Turns out is the icon of Edge.
I find it funny they've worked so hard so as not to alienate the users who think the "blue e" is the Internet but thought it was ok to radically change the interface in Windows 8. In Windows 10 they've half-backtracked by including a stripped-down Start Menu but that would also completely confuse someone who's confused if the Internet changes its icon from a blue e.
Sorry for the rant and semi offtopic comment but I'm really pissed of at Microsoft for the changes to Windows starting in 8

+1 They're hell bent on making a single (or as similar as possible) for phones and PCs and it obviously has to cater to the lowest denominator. Result: The desktop loses the highly polished interface that has evolved over decades. I hate it. The funny thing is, I thought that if anybody, it'd be Apple who would do this (because they're so oriented to simplicity) but they have enough sense to keep the UI for PCs separate from that of tables and phones.

But the price to pay is a worse mouse experice :(

Many of the applications included in Windows have been rewritten with touch optimized ("modern") UIs and that leads to low information density and waste of screen real estate.
The problem is they're trying to make a single UI to be used with fingers and a mouse and keyboard and that's really difficult without making a substandard UI for any (or both) of the paradigms. I use Windows on a desktop computer and Windows 10 should not penalize me for it. I have a mouse that's capable of very precise movements and I want an UI that makes the most of it, just like they used to be. I want lots of buttons and relatively small text. That's impossible for a single UI for both touch and mouse use.
IMO they should make 2 different UIs for each application (all the logic can be easily reused) but today desktops seem to passe.

You're up to +5 already but I'll just say that I totally agree. I wouldn't mind the ugly touch UI and "apps" if there was a switch to change it all to "classic" desktop mode (i.e. Win 95 to 7).
What's wrong?

• Horrid usability for desktop use (everything flat with no hints as to what's clickable, tons of waste of screen real estate because there's so much whitespace in apps)
• Most programs have been rewritten for touch and that means : Tons of whitespace leading to waste of screen real estate, low information density
• You're pushed to use Microsoft services: Bing, OneDrive (can't be uninstalled), Windows Store, Cortana...
• The start menu is back... but is very limited compared to Windows 7's
• Configuration split between a "modern" app and the classic Control Panel

Which is unforgivable since consoles are PCs are more alike than ever. It should be much easier in this generation to port between systems

After a 50$ CPU was able to run Office and your browser with room to spare, Intel and AMD needed more resource-hungry software to make people buy new CPUs, and what better than the most used piece of software in offices around the world, i.e.: Minesweeper :).
On a more serious note, they also used its popularity to get people accustomed to using the Windows Store (in Win 10 you must install it from there or no Minesweeper or other Microsoft games for you).