I'm with you on everything here except the very last sentence.
EV impact is more about toxic particles from tire and brake wear, and greater road wear when most EVs are heavier than similar ICE vehicles. The cleanliness of an EV's power source has been debunked over and over again, showing it's still a net positive environmental impact to run an EV off dirty energy, compared to an ICE car burning gas or diesel.
No such aftermarket infotainment systems exist. Modern cars are way too locked down and way too tightly integrated for an aftermarket to feasibly exist.
Which SUCKS, I miss the DIN system in older cars where you could just put nearly any head unit in nearly any car. Sadly those days are gone.
I use Google's camera app on GrapheneOS. Have been for years. No problems at all, though I wish the camera app included with GrapheneOS wasn't so annoying to use by comparison
The same is true of any modern ICE, you're not exactly gonna get source code or schematics for drivetrain management