A bonus I see about a solid 4 man pass rush is that it allows some flexibility in zone and man coverage so they do not have to create overly tight coverage as would be required if the pass rush was nerfed further.
I watch a lot of All-22 films. I am in no way a professional gameplay analyzer, but I am aware that coverage is very difficult to lock down; they rely a lot on a solid pass rush to help coverages. Of course there are more poor throws in the NFL than MAdden, but we know that won't change.