Surely then you wouldn’t install anything you didn’t want to, if non-App Store installation was possible?
To use your metaphor, we’re talking about the sedan also having a switch that turns it into a 4WD, only as needed and for those who want it.
My job might require me to install apps from Honest Achmed's App Store, Certificate Authority, and Used Cars (https://bugzilla.mozilla.org/show_bug.cgi?id=647959).
I would have bought an Android if I wanted a free-for-all platform with limited security updates, multiple app stores, and other debris; I chose an iPhone so I wouldn't have to deal with these issues.
However that’s not how things work - and eventually I will be forced to use it to achieve the tasks I achieve today without it.
Advocate for yourself, but don’t pretend to advocate on my behalf when you’re actually just advocating for yourself.
Then when everyone is advocating for themselves - that will reveal who is the actual minority.