There is no logical reason to ban vehicles except protectionism and protection of manufacturing capability domestically. There is no security risk from Chinese EVs that requires a full ban.
Just because you're not paranoid doesn't mean they're not out to [map] you.
Of course there is a risk to allowing networked automobile sensor packages on your streets if they're feeding a potential adversary live info on everything going on on and around your roads. Denying this isn't virtuous or smart or benevolent, it is at the best naïve.
They don't need to ban a nation's cars, they need to set safety standards.
But they want cars to be trackable by their own systems, so they don't want the public getting reacquainted with privacy protection.
Consumers want protection from cars they can't afford to fix.
Insurance companies want protection from costly warranty repairs.
Mechanics want protection from cheap highly-integrated gatekept parts that they can't work on, and/or won't get paid as much for.
Said who ? If it's under warranty for long enough and cheap enough then I don't really care even if I have to fully replace it in 5 years and sell for scrap. Without tariffs that's what the price would be.
They may regret it when the battery dies and it's a $20k repair because they're actually structural components on those cars. Or a single $20 sensor dies that's part of a larger non-serviceable $5k component.
That's assuming it's out of warranty, which is now 150k miles or 8 years for BYD in the UK.
The largest other component is the integrated motor/inverter and they should be pretty reliable. They are still repairable, although you might need to replace the entire circuit boards, rather than individual components.
Everything is "repairable" it's just a matter of is it worth repairing. Maybe rebuilding the car every 5-10 years isn't that bad of a model.
Again, if they wanted to work in the interest of affordability and electric vehicle promotion, they would. They're being protectionist for Ford and GM.