Upthread I mentioned LineageOS which I have phased out now except one device used to load public transportation NFC cards.
I had a Pinephone(allwinner CPU) when the SIM reader on my N900 died.
Since this year I have upgraded to a Pinephone pro(Rockchip CPU).
The experience on the allwineer CPU pinephone was a hot phone, slow browsing, and short battery life. The Rockchip CPU Pinephone pro is hot and short battery life but works quickly.
The heat and short life can be solved in software once hardware acceleration is implemented at OS level and CPU scaling is properly employed.
There are still things the N900 did better, mostly music playback and audiobooks which I could listen to all day, the Pinephone will get there.
At least we have all FOSS drivers so we can keep moving software and kernels into the future unlike the N900 which still has a few driver issues. The Pinephone FOSS drivers are also not tied to android and libhybris.
The modularized modem(not tied into the system and memory) and paranoia hardware switches(modem, wifi/bt, 2x cameras) are also a cherry on top of a project designed 100% for the user and not a phone company or a nation state.