I've seen a couple stories on Engadget about iOS 10 allowing you to "remove" stock iOS apps.

The one thing I haven't seen is what this means for default apps. If I remove the Apple Maps app and tap on an address somewhere, what happens?

The default apps issue is one of the few remaining issues keeping me away from considering the iPhone (although Google's apps sort of route around that for me). If they loosened up about that I might be tempted.