There's no 'brake-push-start' in Teslas, It's just 'on' when you enter the car. Set it in drive and off you go! I love it :)

And as a side note the key (phone) can be used without tesla's servers, it's just if you want to unlock remotely using the app or api that you're dependant on that

This is the most unheralded feature of Tesla cars, get in and drive, get out and walk away (). It is brilliant and freeing.

- just keep your phone on you which most of us do anyways.

We do need to have the key fob inside, at least for S/X. But one never notices this because it’s enough if you’ve got it inside your jacket or whatever.