The problem is that 4k 60 doesn't look great, either. For a static image, sure, it's fine. Amazing, even, when the pixel density is greater than you are used to and you are up close.I will be perfectly happy with 4K and 60 FPS. The way I see it is that consoles are now running at 4K, so a new high end PC build should aim for that as well.
But I bought my kid the new XBox X and a 55" 4k Visio to run it on. I'm not all that impressed. Had I researched it more - or been willing to spend more - I could have found a 4k 120, which would be a lot better. He 'comparison gamed' COD on the old XBOne on a 40" 1080p vs the new XSX on the 55" 4k, and, yeah, it was nice to see in large format -- but it wasn't 'knock your socks off' great.
Non-gaming example: I've got a really old 42" 720p DLP tv that I've enjoyed for years. Started watching football on it yesterday and thought. "what the heck am I doing; I should be watching this on the 55" 4k downstairs"... Cut to - the game did not look all that great. I ended up going back upstairs to watch on the smaller screen.
For one thing, AFAIK ESPN is still sending games out in 720p native (thus the upscaling did not look great). We watched a movie on the 4k (Disney Plus, "Soul") which we enjoyed, but I wasn't 'blown away' by the large screen 4k experience. I'm certain that you need 4k for a screen that big (cannot imagine how widely spaced the pixels would be on a 55" at 1080), but the composite of distance from screen, non-native 4k content, and a 60hz refresh rate on a large screen made the three experiences somewhat pedestrian.
All of that aside: I am looking forward to seeing what 4k is like on a fast refresh IPS 32" monitor. The size and pixel density increase over a 24" 1080p should be impressive. Just got to score a GPU to drive it, and since the monitor I want isn't out yet, it helps me be (somewhat) patient in waiting for GPU stocks to improve.*
*However - once the monitor is out, they better damn well have figured out the GPU stock fiasco!