In a car you want muscle memory, not "good for the brain"
I would also be irate if my coffee maker or microwave rearranged it's buttons. Any argument that it's "good for you" is inherently hostile.
What a waste of brainpower and education.
Bad news: worst-case scenario with bad car UX also prevents Alzheimers.
But +1 in part for suggesting an interesting-sounding book.
To make it clear: with bad car UX you may not live enough to get Alzheimers.
Apple gets a lot of pass on a lot of stuff, but their UI is pretty terrible.
What they're really good at is overall device integration.
What I took away from it is that the design decisions at Apple are in the hands of a few. The chain of command is small, it takes countless iterations until it "feels" right and you obviously can't consult with too many people when it's a secret project. A/B testing is out of the question.
There's a setting for this in System Preferences > Keyboard > Keyboard. My recollection is that this was previously a checkbox that toggled the "double-Fn to invoke Siri" function on and off, but as of Big Sur (at least) this is now a popup menu control, where the choices are "Change Input Source", "Show Emoji & Symbols", "Start Dictation (Press Fn Twice)", and "Do Nothing".
My test M1 machine was set up from scratch last year (i.e. no account migration) and has "Do Nothing" selected here, so I can't confirm that "Change Input Source" is the default for new users, but its position as the first item on the menu is suggestive.
That being said, the new interface is terrible. So many things now take 3 taps as opposed to one.
I wonder if Tesla made the mistake of using A/B testing instead of vision-driven design like Apple. (Side note, just finished reading "Creative Selection" by Ken Kocienda of Apple, an interesting read on Apple's approach to design and why it is so successful as opposed to Google's).