I think two questions are mixing.
- Do we need one sustainable device we can rely on for years?
Yes. We do and we can select one to push for hw updates if necessary (how many people uses SFos?)
1a. Why Jolla choose Sony instead of Fairphone?
Because SFos users are more interested in performance than in reuse+repair.
Personal experience: I managed to find a stability only when I switched to Xperia X, due to the hw limitations of Jolla 1
The final turn that allowed me to leave android support entirely is the latest browser update.
My plans are to stay with xperia x until network will permit it