Are you doing anything cool to take advantage of running PostmarketOS? I've thought for a while it would be nice to have a simple writing environment on my clara HD with an external keyboard.
I used it a few time to VNC into a virtual screen to have my laptop terminal on an e-ink screen. It can even run Firefox, though very slowly. Gopher websites work way better.
It's a complete Linux system and most things work just fine!
There's also this interesting project: https://github.com/Quill-OS/quill