Was a early adopter of 1440p (Dell U2711) because 10bpc IPS panel and higher res made perfect sense for editing photos back then. Later on I got a 3440x1440@100Hz ultrawide for gaming, I loved the thing, it's great for desktop use and any game that
properly supports 21:9. Now? I'm back at 1080p for two (and a half) reasons:
1. Not all games support 21:9
2. 240Hz
2.1. 1080p is easier to actually run at 240 fps.
21:9 is still my overall favourite experience, but game support isn't guaranteed, it's pretty hard to run and I'd still go for 240Hz minimum for anything competitive. Pixel density of 1440p is definitely something I miss on a same size 1080p monitor, especially on desktop or when viewing content, but, again, 240Hz is something I'm not willing to compromise. 1080p looks
okay enough with strong enough AA as long as things keep moving and you're not looking at a still scene. I've been oogling at the 1440p240Hz Samsung G7, but realistically I'd probably need to turn resolution scale down to get 240, and in that case I'd rather play on native 1080p. 4k240Hz would be great as it would provide both the option for high res
and easy 240 at pixel perfect downscaling to 1080p in the same package. It's always a compromise, you can't get everything.