Everybody just uses QT Auto and they create horrendous interfaces plus they use cheap electronics with not enough resources to power all of that eye candy.
The chinese can create good looking and useful UIs and they can even go deeper in the stack.
The infotainment is just a small part of a car. It's the thing you interact with, sure but it's just the tip of the iceberg.
in every case I know of moving to qt greatly increased the quality of the ui. Though touchscreens in a car still suck everywhere.
cheap electronics will stand up to use in a car for years - something the fastest computers often fail at. I'm under NDA so I can't give more details.
Those cheap often boot instantly while more powerful ones often need a minute by the time everything is initialized.