24" 1080p is the best and most used size & resolution to play competitive titles, and many of them on Steam are exactly those, such as Counter Strike 2 or Apex. Just those two mentioned have 1.15M online players at this moment, more than literally all AAA tiles in the top 250 combined.
No one serious is going to play competitive FPS games on large monitors (or TVs) in high resolutions, and 27" 1440p is already pushing the comfort zone. On the contrary, no one serious is going to play Baldur's Gate 3 or Hellblade 2 on a 24" 1080p screen if they have an option and ability to enjoy them on a large display in high resolution.
Also what Hotz said above me, completely true.