That is true, but I also believe there are some lower level "nice to haves" they enable on their routers to make sure Bonjour/mDNS works properly for airplay. If not intentionally, I do know that some routers (Actiontec / FiOS comes to mind) that have particular difficulty with providing reliable Airplay connections.

I'll bite, can someone help me understand the downvotes? Actiontec routers (among others I'm sure) may not work well with Bonjour out of the box: https://www.google.com/webhp?sourceid=chrome-instant&ion=1&e...

Airports generally don't need attention for airplay, and that probably leads a lot of people to the impression that you need an Apple router.