Tesla just seems to have simpler and better designed vehicles. There are fewer bottlenecks because there is just less stuff in the car.
Check out the teardown of the Mach-E Thermal System by Sandy Munro for example:
https://www.youtube.com/watch?v=C1dQtlrI7uU
The ICE vehicle business model is to treat spare parts and servicing as a profit centre... vehicle designs reflect that.