Tesla's response to this issue is staggering to me. Summon mode is not a remote control. The car is controlling itself, and I don't think it's reasonable to expect the driver to be responsible for it's actions when that is happening.
This is not a UI interaction that should result in the car driving off by itself. Humans are fallible.
Way to go, Tesla. Great UI design there. I'll be glad to entrust my life to your software on the highway...
I wonder if the way Tesla is delivering software could be problematic. If the way you use your car can change week to week, how are you supposed to know what works and what doesn't? The user may be used to other modes where the car correctly detects when it will collide with something. I don't find it unreasonable for them to expect it to do the same thing here.