Recently bought a 27' 1080p 165hz monitor

So I recently bought a 27' 1080p 165hz monitor. A lot of people were saying "oh don't get a 27' 1080p monitor the graphics will be grainy" and other things like that. I gotta say after having it for like 2-3 weeks now I honestly don't see the point of getting a higher resolution display. I mostly play Dota 2, some Paradox games, some story games and a lot of older games, like before 2020 era.

Can someone tell me if there is even a point of getting higher resolution? I am now wanting an even faster 1080p display just because I don't care about the resolution at all it seems like. Especially since 240 or 280hz will make a bigger difference than 1440p.