Would you pay $1000 less for a Tesla that is otherwise equal, but has a crummy old school infotainment screen? Even if you would, I guarantee 99.9% of people wouldn't.
By giving you fancy infotainment features, most consumers perceive the value as much higher than the marginal cost to the OEM, so they're more likely to buy it vs some barebones device that just has a battery, motor, and basic radio.