Facebook, as a platform, has long since lost the relevance as a social network, it is basically just an ad platform these days. So why keep wasting resources on trying to block ads from an ad platform? A user who does not want to see ads on Facebook probably should just stop using Facebook altogether.
I get the appeal for staying on Instagram, Youtube, Reddit and other platforms despite the ads: these provide some sort of - maybe controversial - value for the user, even if it's just cat videos or whatever. Facebook has lost its value proposition so long ago it's hard for me to understand why would anyone tolerate using it to this day.
uBlock's resources are much better allocated into other initiatives: like Chrome .