Since Fairphone is no different than other Android phone makers, it also went through a lot of challenges when updating the Fairphone 2 to Android 10. It is powered by the very old 28nm Snapdragon 801, which Qualcomm stopped supporting in 2016.
Reparability and sustainability unfortunately come at a cost. Fairphone sells its phones in limited regions, which does not include the US. They aren’t the most specced out phones on the market but are yet on the higher end of the price range.