The convenience here for you is CarPlay though. You could instead use a different more accurate gps device you plugin that doesnt have the data leak issues concerned in articles like this one. Then if you really needed you could pull out a sort of external monitor stick it over the other display when carplaying and when needing car-vital features you need the car display for, pull over and temporarily do that thing then pull your extra monitor out again and keep going.
I think maybe being grounded has changed - I would be comfortable doing what I described but I imagine your comfort with your preexisting solution means your ground has shifted and a reality check means you woudl rather give away your data than take the higher friction option?
I think most people would not be on board with your solution, but in general to your point I would say everyone draws the line somewhere different.
Yes there are many (maybe most) who will not give up their comforts or risk modifying their vehicle in order to make it more private... but trying to play the judge in a made-up internet game of altruism olympics is not going to convert many people either.