if U.S. could have opened its market to Chinese EVs (yes yes I know Chinese Gov subsidizes those vendors a lot, but U.S. can still do punitive tariffs, instead of just ban[1], and of course, making excuses out of national security, meanwhile Tesla is doing okay in China) these U.S. vendors have no competitions is the reason why they are far behind.
[1] https://www.reuters.com/business/autos-transportation/biden-...