It does make me glad that I only have quail. ;-)
I probably wouldn't be that strict personally since I try to practice good biosecurity anyways. I have a pair of garden shoes that I wear only in my yard, and I don't wear my regular shoes in the yard. I've only added birds that I've hatched so far, but I have a quarantine area set up in my garage for any that might get sick or if I do pick up any birds from outside.
If you keep those kinds of practices, you probably don't have to keep them that far from each other.