SailfishOS is the sort of niche project that never has a stable future, and always has a too-small community; being worried about it is par for the course.

FWIW, my XA2 works nicely with Koli.

I uninstalled PatchManager because most of my patches stopped working after the last upgrade; since they are user-contributed and it's up to them to ensure compatibility with higher versions I don't see how this is something that would speak against SFOS itself.
I also might have made a mistake during the upgrade process, regarding PM3.
SFOS is hackable. That increases the danger of breakage. I am not blaming SFOS for that.