What would AP do, when engaged in the middle of a lane change? Think for a second. Which direction should AP go? The OP put the algorithm into a no-win situation.
How can any reasonable analysis come to any conclusion other than that this is an edge case and that AP was engaged improperly?
I'm as enthusiastic about AutoPilot & FSD as anyone, but yes, I think it's entirely reasonable to conclude that
- The car should not accept and initiate AutoPilot engagement, if doing so requires immediate and abrupt emergency corrective action.
- Whether it's L2 (now) or L3,4,5 (in the future), the engagement command cannot reasonably be used as "save me right now from an existing or rapidly-developing emergency that started while I was in control".
- Therefore, and considering the obviously common scenario that the car is not presently positioned or driving exactly how AP would have had it, an abrupt transition into AP's preferred condition is unwarranted, confusing to everyone and very likely dangerous by causing nearby vehicles to take emergency-avoidance action.
- It's only a no-win scenario if AP interprets the request as an inescapable and immediate mandate to get the vehicle into what would have been its chosen condition.
It really doesn't matter whether experienced Tesla AP users, diligent manual-readers or forum-watchers would know not to request AP engagement while not well-centered and driving in full agreement with the computer. Unnecessarily abrupt maneuvers are dangerous.
If you are holding a glass and taking a sip, and your wife asks you to empty the dryer, it's not correct to spit out a mouthful and drop the glass to the floor.