Everyone has 4K is a dumb argument. Most have 1080p. The sensible upgrade path for PCs is 2K. Legal streaming services only support a few devices, so a 4K device may be stuck in 720p. HiDPI is also, somehow, still an unsolved problem in this day and age? Same thing with HDR, especially since many self-proclaimed HDR TVs aren't even good enough to achieve what any layman would expect from a HDR TV. So HDR certifications became a thing, amazing. But 1080p SDR remains the king for now.
Afaik the problem with HiDPI is that fractional scaling sucks, so you have to jump from 1x to 2x to have good quality. For 1080p, that means 4k. So you should end up with the same screen size as you have now, except with four times the pixels, and four times the electricity bill because your hardware needs to render all those extra pixels, and this for some marginal semblance of an improvement in image quality when you look closer at your monitor than you're recommended to if you want to keep your eyesight.
