Mainly in terms of firmware for actual phones, taking photos is basically impossible as the photos either look horrible or don’t work at all. Frequent sound issues, lower battery life, unreliable mobile network connection and lack of inbuilt esim support. OSes based on halium have better experience though they do still lack the app support.

Unfortunately only postmarket is actual Linux os from these and it’s far from daily driveable, lineage and graphene are android roms and are therefore dependent on Google’s decisions with AOSP.