y'all babbled about this stuff and now here's my babbling:

I have to opine, a garage door opener is a power tool. I wouldn't
operate it from beyond my direct line-of-sight anymore than I would turn
on the table saw and walk out of the room.

IOW, I don't need no stinking electronic sensors to keep me from killing
some kid, I was born with a pair of organic sensors that are sufficient
for the task.