You can leave the infrared sensors in place, and use the relay to simulate a button press. It wouldn't be any more dangerous than clicking your remote when you can't see the door.
Maybe some people in individual houses watch and wait for their door to be fully closed before driving away, but that doesn't seem to be the norm for collective housing (I've certainly never cared myself) or even for most individual garages around here.
They have pressure sensor strips along the bottom to detect impact that's not the ground, to make this reasonable.
It's not some new idea, it's the current state of all of these remote doors.