Not every client or wallet supports ownership of addresses. You could be sending coins back to a hot wallet, where they're indistinguishable from coins that I

Not every client or wallet supports ownership of addresses. You could be sending coins back to a hot wallet, where they're indistinguishable from coins that I don't own and they don't even come back to my wallet balance. You could say "not my problem" but that's adding a lot of overhead to the brain of my wallet's mixing service that we didn't have to deal with before :)