An extra few percent is not going to help significantly, but it will create a noticeable box around media. So a small upside with a (for you) just as small downside.

If we want taller screens, then we should use 16:12 or so. If 16:10 is the perfect ratio and 16:9 is just off, then I honestly don't think it can be bad enough to justify the cost of change, though I am of course willing to be convinced by research.

I've no problem with that, I still use 3 5:4 panels at the office. But so far 16:10 was the best that you can get for desktop machines at the very least.