If you want "a phone" with PostmarketOS, forget it now. It can be good as a portable mini computer for remote connecting to a servers and things like that, but until you are about to take sacrifices of for ex. not working camera and do not want to be sure alarm clock app is going to ring at the morning this won't be for you.

It's much less polished, stable and pleasent for daily use as Android. But they are good reasons why people are developing it.