True, the game and engine scales well but I like them high frame rates. I have 4070Ti which is pretty okay but running MW3 doesn't quite cut it for me at 4K. When I was on my old 1440P monitor, I could get 220-240fps (DLSS Quality) in MP. Now I've gone and upgraded monitor; only getting 160-170fps at 4K Performance.
That and I can play games at 4K with heavy RT (plus any mods), without them shitting the bed due to the lack of VRAM.