The traditional car companies specialy is not cars. Its manufacturing and supply chain management.
Tesla does seem to be mastering manufacturing, and being more vertical they dont need as much supply chain handling.
They are not particularly advanced in tech from what I've seen. They do have a bunch of young motivated engineers that have a lot to learn and they can skip over a lot of things and take advantage of the supplier network providing the hard stuff.
You may not have seen as far as Sandy Monro [1]
[1] https://cleantechnica.com/2018/07/16/munro-model-3-electroni...
I've seen further than that. I did read something a while back that sounded like they have a nicely integrated inverter/motor combo.
Don't forget the finance side of things! GMAC was founded 101 years ago and also got a large portion of the bailout.