To hell with environment. Let's make a PC heater. Future nVidia GPU's are a joke with power consumption. AMD isn't any better.
Let me know when you come up with a solution to get Dennard Scaling back in track.
Going 4K is like when you went from dial-up to broadband.
"Welp, there's no going back to that old crap now."
It depends on the content, I'd argue. If the content isn't infinitely scalable or has been "mastered" for that resolution, then 4K isn't really worth while.
I made an initial dive back in like 2015 or so on a 27" monitor. For the UI, yes, 4K with 125-150% scaling is leagues better than 100% scaling at any resolution. However, for games, I couldn't really see enough of a difference for it to matter. 1440p looked pretty much like 4K, maybe with a slight fuzziness but not enough to be bothersome.
I moved to a high refresh rate 1440p monitor a few years later. However, I've seen examples in screenshots where 4K provided clear details for distant objects, but at the same time there's the question of how often does one care about the finer details of objects far enough away. I might go back and see how today's games look since 4K should at least given some consideration.