I side with the OP's position and would use this as an analogy: Suppose Tesla removed the metal brake and throttle pedals from the Performance version and substituted with the generic rubber ones that are on regular S models without making any announcement, would any one here be happy with that and think it ok (I ask rhetorically). I think not.
Right people would be upset. I am not saying they shouldn't be. But threatening legal action, and saying you spent $12k mostly for aluminum pedals is pure crap. Complain to Tesla. Maybe they can give you a free parcel shelf or something.
You signed an agreement that said "Tesla can change things without notice". You bought something site unseen. You got it mailed to your house. You have to accept some risk here. It sucks but deal with it. I don't have driver profiles. I am very irritated about it. I don't seem to be threatening lawsuits, claiming that I spent the $4k for the Tech package to have driver profiles, or claiming the car is somehow worthless now. I am dealing with it.