Why not 4k oled for gaming

Heya,

Been seeing alot of posts and comments by people saying that you shoudnt buy a 4k oled for gaming because, generally, it is demanding to use to full use.

Why should i not buy a 4k oled but a 1440 oled?

Currently rocking a 4070 TI super if that would be of any info

I mostly play multiplayer, rpg, rts.

I just really need to be confinced why i should not buy a 4k oled haha

Edit: thnx everyone for the comments, insights and suggestions. Helping out a lot