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My old car was a Toyota Rav4 2001 and my only usage of the infotainment system was to play music and get directions from google map (voice via bluetooth). I think the only controls I used on the head unit was the volume knob and the call button (to receive a call). I've never needed anything else.

This is not a counterpoint to your argument. It's more a context about the following question: Is the infotainment on a car actually useful?

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No. The ideal infotainment "system" should be a volume knob, the minimum interface to get a secure connection, and a good modular tilt-and-swivel holder for a phone with obvious cable routing for a power cable and optional wireless charging.

Vehicles should be designed to last ten years so that the resale market can support the ridiculous prices for new. The infotainment system is the only part that is subject to external technological compatibility issues over that timespan.

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