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The Sotsu "Flip Action Elite" (I think that's the product name? it was in a recent mrwhostheboss thin tech video) is exactly that: 3840x2400, 16", 450 nits, 14.3mm thick, and definitely had "slice the top off a laptop" vibe to the design... I don't know if you can actually find them though, but it looked really shiny :-)

Trivially available at B&H for about $750. Speaking of DOS games, it's about half the cost of an IBM VGA monitor from 1987, in today's dollars.

With a large enough OLED you can just leave some actually black borders and get perfect integer scaling in all cases.

External 16" 3840x2400 monitors are ~$150 on Amazon.

Sorry, I forgot to mention that you can find them in 16", but I would like at least 24" to use it as my main monitor.

What's surprising (to me) is that there exist 3840x2560 28" IPS panel monitors on Amazon for only $150.

Yeah, I have also seen those ones. Why 3:2 instead of the more common 16:10 is a mystery to me.