I agree with all your points except
- They run worse than Firefox based browsers in my experience
It has been proven many times chrome is better optimized on android vs firefox. If I didn't care about addons, privacy and the bottom navigation bar i would be using a chromium fork. They are that fast and bugfree especially on graphics heavy websites. The lag and speed difference is very much noticeable on low-end and midrange phones. Infact i was daily driving bromite until it stopped getting updated.
Fairphone offers 7 OS updates and 8 yrs of security updates.