> The external monitor I think was capped to 1920x1080 (if connected to a 1440P display a huge chunk was just static)

That happened to me with the PP, but I can reliably use a 1440P monitor with the PPP. Not sure if it's the phone, or the fact that I added a power cord to the phone while it was connected. I can't remember if I did that with the PP.

EDIT: Scratch that. It's because I used the official dock with the PP, and for the PPP I used one I got on Amazon.

The official dock is docked (:P) to 1080P.[1]

I wonder how it happened that the de-facto standard here is for the protocol going over USB-C to be DisplayPort, but for the hardware connection to be HDMI, and so leading to docks needed to be spec'ed to the resolution you want instead of being passive.

[1] https://pine64.com/product/pinephone-pro-usb-c-docking-bar/