>>106393435
I have a pixel 3a running Ubuntu Touch as an experiment. Every now and again I get it out to see what's changed. Development is extremely slow, but it's surprisingly usable.
It mostly needs some polish to the gestures to make it feel less like it's fighting you. Android and IOS are absurdly polished these days and it makes it hard to use anything that feels dated.
Support for modern hardware would be great as well, the performance of these old phones is pretty poor.