You could similarly argue that phone makers should concentrate on making and taking calls. Turns out, that's not what consumers care about once a certain bar is cleared (a pretty low bar; call quality is notably bad on many modern cellphones). They care more about other stuff like... being good at navigation.
This has been put to the market test in China. For EV purchases, most consumers turn out not to care about the "car" aspects beyond a certain point. If the car drives okay and has acceptable safety, what matters is the Internet-based bells and whistles.