Its not even software issues (I mean the software is still very early, but improving), the pinephone hardware is ridiculously underpowered while simultaneously drawing too much power.
The Pro fixes the underpowered issue, but gives you a couple hours of screen-on time. At first I was hopeful software updates would fix the battery life, but the same operating system (postmarketos) gives me a full day of use on my other phone (oneplus6). That leads me to believe it’s largely a hardware issue.