So Summon mode, which Tesla itself advertises as, amongst other things, a way by which your car can put itself in the garage (https://www.teslamotors.com/blog/summon-your-tesla-your-phon...), can't see objects that are not 'on the ground' but in the air, like, say, a Garage Door...
Especially since the PR reads "It will open the garage door and come to greet you." That implies sufficient sensing to detect garage door clearance. Going into a garage automatically, without sensing overhead or projecting objects, is going to cause problems. Especially since the user, who's probably behind the car at that point, is in the wrong place to see obstacles.
(Oh, but it's "beta". No, Tesla, that doesn't excuse you.)
It is the responsibility of the driver to check to make sure the car has a clear path. In other words, you get out of the car, check to make sure everything is clear, then engage the feature.
The sensors are only there to tell the car when to stop (as in, to sense the back of your garage).
What if the guy activated regular vanilla cruise control and rammed into the truck. Would everybody be going off on Ford/GM/etc.? I doubt it.
That's a little different. Tesla advertises the feature as you being able to walk away while the car parks itself (and in some promos, even opens and closes garage doors by itself).
That's more than a little bit different from "careless on cruise control" (which, point of fact, most (new) cruise control systems will prevent due to those same sensors).
Not when you realize that one of the use cases from Tesla themselves is that the car can open the door and close it by itself. How does it know when it's safe or that there is clearance, moving or not?
Seems like something of an oversight.