/shrug..
FWIW, I have carplay on my wifes 2019 BMW (wireless carplay even) which I only enabled for about a week before turning it off to go back to BMWs idrive interface, which I happen to find superior. One of the reasons I likely find it superior is simply that I am used to it. I know where everything is, and its comfortable for me in that car.
I didnt like carplay at all, either in my wifes BMW or any of the various loaner cars I have had over the years when I would travel (back when that was still a thing, traveling, heh). That doesnt mean someone else cant like it, it just means I dont care about it. If they implemented in a tesla, I wouldnt use it, but that doesnt mean others couldnt.
Car companies didnt WANT to implement carplay / AA.. they want to own the infotainment stack, not be a dumb pipe. Consumers want some system like that so they can get into any car, and have it all be familiar. thats best for the consumer but not the car company because they cant differentiate themselves except by price, which no "luxury" manufacturer wants to do. Thats why carplay was free in the kia's / hyundai's, etc, and companies like BMW didnt want to implement it (charged for it) then even tried to charge yearly for it before walking that back.
The reason that
@CMoZ lays out about "why would I want to rebuild all that???" is the same reason the companies all want their own infotainment... so that you get used to THEIR interface, and when you go buy your next car, many people gravitate to what they are "used to".
Tesla is forcing some of these companies to do things like provide updates for the car you own, rather than making you buy a new one to get new features, etc. I think thats great. They also want to own their own infotainment stack. I personally think thats fine as well. I understand why a consumer wants something different, but its certainly not best for tesla to do it, and as long as they keep adding features for free, I have no issue with it... even if I dont use most of them.