I tried a Pinephone with postmarketOS and I concur with the battery life - I could never use the pinephone practically, because in standby laying in the shelf, the battery is dead in about 30 hours.
I so wished there was a Linux distribution with proper phone support & tuned to sustain the battery power, but usable with a docking station.
My dream is to no longer have to carry a laptop anywhere, just my phone, and a keyboard (if needed) and mouse, and a USB-C hub with HDMI cable, mouse & keyboard USB ports, then plug in that phone to a hotel TV or a monitor at a business partner's place and work directly on the phone.
Laptop stays reserved for stuff that requires more computing power than LibreOffice.