You do realise that the cheapest monitor in 4k
costs atleast 32k from brands like Lg and samsung and you would need atleast 1 gtx 1080 to get decent performance on it.
Most people in gaming community don't actually have that budget.
I think you mean skipping on those 1440p monitors since they have a price tag closer to 4k.
Otherwise the 1080p is still a fine resolution for gaming and general purposes, though a 120hz-144hz monitor is definitely recommended for competitive gaming if you are willing to extend the budget.