I think part of that comes from the (reasonable) assumption that the simpler you make your UX, the less friction there is for people using your service. But it would be nice to see someone work on bringing more granularity and flexibility back to social media, even at the cost of a little more friction.

(I also suspect some of it comes from people looking at Apple's historic "make simple things simple" approach to UX and taking the wrong lessons from it, which arguably includes latter-day Apple, but that's a whole different post...)