There is no point using anything bigger than 24" for desktop PC gaming.

I've tried 27" 1440p multiple times. I'm even on one RIGHT NOW because I wanted to try it out again. Otherwise it just dusts inside a box. And surprise surprise it just makes everything I do slower. In games and on desktop.

I open 4chan and more than half the page is just empty white background. Same with Google. On Twitch all the streams look worse than usual because my desktop and text is so sharp, 720p streams might aswell be unwatchable. The screen is so big that the video is huge compared to the chat, even without theater mode. More adventuring with your eyes and mouse, harder to make fast clicks.

And in games I need 50% more power (not a problem for me, but still) and I register less information because my vision can cover less of the screen. Objects seem faster because they are bigger. HUD in some games just feels like it's assaulting my face.

Just think how far we sit from a TV. Think of the recommended viewing distances. Even when compared to a movie theater the size of the monitor on your desk is fucking huge because, well, it's on your desk.