Don't get me wrong, just because I will miss having these things doesn't mean that I will love my Tesla any the less; what I will be getting vastly outweighs what I will be missing.
Apple Car Play
AM Radio
Map database on board
Seat cooler
Steering wheel heater
CD player
Side mirror dimming
Blind spot warning on the mirrors
After almost 14 months in the Model 3, I miss in descending order:
Blind spot & rear cross traffic warnings.
Apple car play (more for txt message handling)
Heated steering wheel
Ventilated seats, although I miss them a LOT less than I thought I would
I think I would indeed miss the dimming mirrors - glad I have them.