Not at all. You can open it with a phone app (which does require connectivity for both the phone and the car) or a keyfob/proximity key card.
I've operated my Tesla many times well outside of any network connectivity.
EDIT: Full and accurate list of the four ways to get into a Tesla here: https://news.ycombinator.com/item?id=29283262
I am curious what you mean by a proper quality car since all cars have governors which limit your speed or have computers in them that prevent you from fixing things yourself. Though I do agree with you that I wish these restrictions were lifted, I doubt it will ever happen. Only way is either building your own car or buying an old one without these "features"
What I dislike is companies putting unnecessary, unsafe, crappy software that's full of tracking/spyware in their products. This is common with SmartTVs and lots of things in the smart/IoT space. I've seen the damage done and I just dislike the lack of choice and want to vote with my wallet.
It took me long as heck to find a quality non-smart TV because I didn't want the lack of control, programmed obsolescence and shitty-ness of smart TV software.
I wonder if I won't be able to have a proper quality car really owned and controlled by me in the future.
EDIT: Ok, so it seems it supports a Keyfob. Then all is good.