The 3090 will pull above (and sometimes well above 60) FPS average at 4K so I think there's less of an argument for using it as a high FPS 1440p card when in a lot of cases it's a high FPS 4K card, but it's a lot easier to get a 1440p monitor that will offer not only the potential for those high frame rates, but the other bells and whistles you'd want for a good experience.
The 3070/6800 are better 1440p cards in my opinion, or at least a better fit, but everyone has their own preferences. Personally I'd rather have completely smooth gameplay on a display with the best picture quality over an increase in resolution if it means compromising either of those things.
The 3070/6800 are better 1440p cards in my opinion, or at least a better fit, but everyone has their own preferences. Personally I'd rather have completely smooth gameplay on a display with the best picture quality over an increase in resolution if it means compromising either of those things.