I had a deposit in for a Model 3 prior to locking down my MKZ. I ultimately decided the toned down final design wasn’t as good looking as the initial pre-preduction look. Thankfully I pulled the deposit as I needed a car in the spring and I would have still been waiting.
Anyway, no, they will not complain about lack of buttons in the Model 3 because as I said above they are biased. They will suddenly have a newfound understanding of how technology works and miraculously develop better memories that allow them to remember new movements and vocal commands.