The purpose of smart locks such as these is never convenience. It's not even to make money.

The purpose is to deprive you of the resource they control should you say something they disagree with.

In fact, this applies to all smart devices, and IoT gadgets - to spy on you, and to control you if you step out of line.

"Oh I'm sorry your dishwasher won't start, should have thought of how much you valued having clean dishes before you started speaking out against the regime"

Obviously, that doesn't happen right now. But if the infrastructure is in place, all it'd take is a software patch and suddenly we get a dystopia that nobody could see coming and everyone reached for with arms outstretched.