This makes sense - nearly everyone's phone can send an SMS. Having to install an app just to unlock a door is an unnecessary barrier.
Yes, but the door is a necessary barrier, so I don't really care.
There is a potential issue if you're talking about sending someone a code (or multiple codes) several days in advance, but I don't think the systems are set up to do that currently.
Plus you get an alert and a picture/video whenever one of the codes is used so it's fairly high risk for a burglar. You get an entry alert and it's some dude in a mask you call the cops. I tend to think that they'll stick to the old fashioned way of just breaking a window instead.
Breaking into houses doesn't require Oceans 11 technology.
Amazon Key: unlocks your door with a app.