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Teslas drive fine without Internet access, but many features of the car need data: Maps, Spotify, YouTube, Netflix, smart summon, locking/unlocking from outside of Bluetooth range, etc.

I don't think there's any Tesla feature that is deliberately gimped due to lack of Internet access.

The second obviously.

On serious side, Tesla definitely could implement a security check if it's rebooted and there is no network connection on startup. Obviously not when already driving.

Then you have an issue when you're in an area without good network coverage.

Elon says he is working on that

I doubt Elon can do much to address a not-so-uncommon scenario when you park your car in an underground garage or elsewhere where layers of concrete just simply block any signal.

Maybe satellite internet...

Or during any sort of natural disaster.

I would hope not. There are plenty of places left where one can drive a car but not have Internet access.