I've been running Linux on the desktop for 20 years. I'm happily running Linux on a tablet (a Microsoft tablet at that). I run a third-party Android build with root on my primary phone. I am the ideal user for a fiddly operating system.

I put PostmarketOS on a spare phone and spent a good bit of time playing with it. It would be painful to try to daily it at this time, and completely unusable for many of the common smartphone use cases.