These are the most supported devices, maintained by at least 2 people and have the functions you expect from the device running its normal OS, such as calling on a phone, working audio, and a functional UI.

If the above is where we are at still with PostmarketOS, it will be a decade or more before it is anything more than a curiosity. The table stakes of what people, even us tech nerds, expect from a smartphone fit for daily use is so much more than "it can make phones calls and the UI works" it is not even funny.