Electric vehicles are also not rocket science. A company who has been making vehicles for a century will have a substantial leg up once they get some momentum. They’re far more simple as far as the driveline goes than an ICE powered vehicle would be. No transmission. No oil coolant lines. No engineering the engine and trans to work together. No fuel tank, no fuel lines, no injection system, no fuel pumps. The list goes on.
With an electrified powertrain it’s basically just a motor and juice (I’m over simplifying, electric motors and batteries require cooling as well for instance).
These companies are going to eat Tesla for breakfast as soon as they get caught up.