Very true, and above instructions are good advice.
But this implies that one can adjust AND actively use mirrors properly, for BSD and other functions.
Unfortunately, this is not likely to happen on Model 3's for at least two (2) reasons:
- Model 3's side view mirrors are not wide enough, and don't swing out far enough to provide proper coverage angles.
- Tesla preaches, and most folks on this forum trust and rely, that Tesla's software will take care of BSD and most other driver's responsibilities.
To answer OP's question - yes, the v10 blind spot threat (red car) notification has been inconsistent and temperamental. You should rely on it just about as much as you feel comfortable relying on all other AP features.
Namely - trust, but verify at every turn (pun intended)!