Win10 has reset my preferences for HTML, PDF and JPG files across several updates. Additionally, it takes a LONG time to boot during these updates. I literally walked in to work one morning needing to send an email. After two reboots and logging in, waiting for Outlook to pop up, I finally gave up and composed my email on my phone. No sooner than I got outlook running, the O/S wanted ANOTHER reboot for another queued update.
Sounds like you have a bad install or unsupported hardware. Haven't seen anything like this with any of my systems (4 systems, which 2 are 5 years or older), the 50 windows I support at work or any of my close friends. For the most part most users had very positive things to say about the OS.
As for boot time, my boot time is 8 seconds on my most recent hardware and about 60 seconds on the old hardware. I think something is very wrong with your hardware or drivers.
Now look at this from the perspective of grandma and grandpa who just want to see the grandkids in email..... The IOS devices and even the android devices boot faster and when they do an update you don't even know it because all the apps stay where they were across the update.
Those devices are simpler and are much better suited for the clientele you suggest. Simple internet and computing usage requires nothing more than a tablet.
And we wonder why Win10 is losing market share?????
Where does it say that? Every article that comes out seems to suggest a higher number of users adopting Windows 10. Here's the stat counter for Windows 10. Constant incline. http://gs.statcounter.com/#des...
I'm all for pissing all over a product but it needs to have a foundation to stand on. One bad user experience doesn't tell the full story. I could easily have a biased opinion at the moment because I just had a really bad experience with MS on the licensing side but I try to stay impartial when evaluation a product regardless of my views of said company.