It's just when they're all bunched up in NY, it gets sillier explaining why this dude or that lady don't help during this thing. At least with DC they can just say "I've got my own city!" with a straight face.It's a big city and most of the heroes that live there don't even do hero stuff in the state. At least not exclusively.
Fantastic Four gets a pass since they're rarely in this plane of existence to begin with, but thinking back on Bendis' New Avengers, it's kind of funny that in terms of heroes who weren't already there like Jessica Drew, Luke Cage, and Matt Murdock, Spidey, Cap, and Iron Man were the only ones who came to help at the Raft. Especially when you look back at how many showed up during Disassembled not long before that.