Well one very good reason would be that their specification is closed source and as such not even HDMI Forum partner AMD can implement them in their open source driver.
For a long time we had VGA for video cables. There was no VGA version 2.1.9, now supporting 1024x768 mode with 16-bit colour. Cables did not cost $29. There were no rent-seeking patent holders charging license fees, or at least they weren't obnoxious enough that we knew about them. It didn't have five different types of connectors. There was no VGA consortium constantly keeping itself in the news with periodic press releases. Companies didn't need to sign away their soul to write drivers for it. There was no VGA copy protection trying to keep us from decoding our own video streams. Cables didn't include enough microelectronics to power a space shuttle.
I personally prefer 4k 60 (of course, high hz is better)
I ajust zoom level according screen size, on 32” 4k, I have it mostly around 125% zoom
On my 14” i have, i think, 2550 which as well looks amazing and allows to be usable at 125% as well
I adapt zoom level according on what I am doing, I like having options to go tiny icons and a lot of space or have it big if I am e.g. in a meeting and have to adjust screen distance to be normally visible by the webcam
I mostly want displays to not be something I worry about. Even if I just have a single port, being able to connect 3 4K monitors without worrying about their refresh rate is convenient.
I need 4k to be happy, with 1080, you have giant windows in you OS (like most apps are only usable in fullscreen) even on 100% and still see single pixels so well…
Straight unusable for me, maybe on a phone with max 5” there 1080 is like a good middle ground (battery vs resolution vs not seeing single pixels)
Yeah, 1080p is fine on a small laptop screen, or a small TV on the other side of the room, but it's unusable for desktop applications. Even 1440 is noticeably low res. I disagree about phones, though. I think 1080p is overkill and 720p is fine.