My take:
4k is overrated and unnecessarily taxing
Framerate is much more important
Every game has different graphical settings which may or may not really affect what you see significantly but can be very taxing, so whether or not something can be run with everything on “high” or “ultra” probably doesn’t matter.
Build a rig that can do what you want it to do instead of worrying about hitting some arbitrary benchmark. 1440p is fine by me. 1080 is too if I want to output to my comfy couch. Whatever settings I need to go to ensuring >60hz at those resolutions probably still look great because I still play my NES on a CRT and that’s fine too
We hear it all the time, don't we? 1050p is overrated, 900p is more than enough and is much less demanding. 1080p is overrated, 1050p is more than enough, and is less demanding. 1440p is overrated, 1080p is more than enough and is less demanding. 4K is... History repeats itself over and over again, few years from now we will hear how 8/10K is unnecessary and 4/5K is the sweat spot.
You see, the reason everything looks so damn awesome on 5-6" smartphones, at 1080p, hell, even mere 720p, is because the PPI is so damn high, while PC displays aren't even halfway there, let alone 55-65" TVs.
I'll admit, things have changed a lot with 3D era and its legacy that is high refresh rate monitors, then on top of that Nvidia changed the game forever with G-Sync, and high framerate is desired more than ever on PC ever since, but still - graphics cannot progress without resolution, the more pixels displayed the more details are shown, and vice versa, the more details there is the higher resolution is needed to show them, asset quality and resolution are just tied together whether we like it or not.