Of course it's a problem. I just outlined a use case. I don't want to leave my keys in a supermarket. The other scenarios (traveling and needing to grant someon

Of course it's a problem. I just outlined a use case. I don't want to leave my keys in a supermarket. The other scenarios (traveling and needing to grant someone access, for example) don't really have a good solution. If you can afford a maid, then I doubt any of this would count as a problem, though.