3D-printing is overkill.

When I buy a new mouse, I remove the mousewheel. Then I build a middle mouse button that fits in its place. I cut pieces of styrene and put them together with plastic cement ("model glue").

I use the middle mouse button mostly to open new tabs/windows in web browsing where invoking the scroll wheel inadvertently causes the page to scroll away from where I'm clicking. That is very annoying.

Most mice I have used use the same type of microswitch for the "middle button" as for the left and right buttons, but in most mice the buttons are levers with a rod on the microswitch.
These levers are usually the same on the left and right buttons, but very different on the middle press so the sensation is very different.

But most of Stargate SG-1 was aired in the 00-ies.

Yes, but instead of having a status register, you compare each item in one vector with each vector in another and get the results as a vector of booleans.
Then execute a SIMD instruction, where each component scalar operation is conditional according to each corresponding boolean.

Or, you could convert that vector of booleans into something else. For instance, you could count the number of leading 1's in the vector and store into a scalar, which would allow you implement operations such as strlen() or strcmp() with vectors.
(It is a bit like programming in APL, if you have tried it)

These types of operations have hitherto mostly been done by DSPs.
An architecture for general-purpose computing under development that would do this well is The Mill. Mind you, it is very interesting in other ways. There is a lot of stuff about it on the web site, and good talks about various features on Youtube.

I agree with what you say, but I would like to add curved to that list of things to look for now that curved screens are coming.
While curved TVs are nothing more than a marketing ploy, having ultra-wide computer monitors be curved makes a lot of sense. I've never seen anyone use a two-monitor setup with both in the same plane - always at an angle to each other.

However, I have heard said that curved computer screens would be worse for graphics design/editing work. I don't know if that refers to them not being flat, or if accurate-enough colour reproduction isn't available in curved displays yet.

I want to see functional and well-designed stuff. Things that contain the capabilities that people like, those capabilities done right to modern specs and the absence of cruft.
Apple under Steve Jobs did manage to follow this ideal, except that they liked to lock people into their system and upgrade often. Lenovo has also followed this ideal, mostly.. except for their consumer space.

For instance, I am not interested in any Windows tablet without a stylus.
No curved TVs.
No laptop that requires you to open the lid to turn it on while it is "docked".
No "smart watches" that need to be recharged every eight hours, or every four hours after two years because the non-replaceable battery has degraded.

Please!

Indeed something along that line is what I think the Internet protocol needs. While IP is freely packet-switched and may appear stateless when you glance in the specs, TCP/IP routers and hosts are actually session-based internally and the number of concurrent sessions is limited.

It is not only intentionally malicious code that can cause denial of service: legitimate programs that are merely badly designed can also do it.
Then it is not the network and the other services running over it that should be punished by being throttled, but only the individual node or badly behaving program.

Also, what we don't need is something that could restrict innovation in new protocols over TCP/IP. If the Internet infrastructure would allow not much more than only email and HTTP/HTTPS (which some ISPs are doing in some countries), then attackers are just going to find another attack vector .. on top of a TCP/IP that permits it.

The point is that you are supposed to hold it for a whole year.

My new year's resolution is 210 PPI.

These are better than the rubber domes found in membrane keyboards in a number of ways, including feel, responsiveness, and durability

No, that is not technically correct, and is somewhat of an elitist attitude.
Feel is something very subjective. Responsiveness and durability depends on the particular brand and type of switch that you use. There are some very good rubber-dome and scissor switches as well as there are mechanical switches that are crap.

Back in the '80s and early '90s when mechanical key switches was the norm there were more types available. These days, the market is dominated by the Cherry MX. It was one of the better mechanical switches then and now and it comes in several varieties. These varieties can feel quite different from each other, and you might like the feel of one, all or none of them - and that is OK.
The Cherry MX has also been cloned several times by other manufacturers, often in lesser materials and with larger tolerances.
The big durability argument with Cherry MX is not that they wouldn't break: because they sometimes do. The durability advantage is that you could replace individual key switches (or parts) that have broken.

Finding Danish beer these days that is not IPA or does not taste like IPA is a problem.

Of course, you could always go with cheap lager, but you wouldn't want to do that either.

MS Surface (and clones) are not tablets. They are merely laptops with bad screen hinges.