Social discovery is obviously something people want or they wouldn't use social media services in the first place. Pointing to the existence of other contexts where that doesn't matter is neither relevant nor insightful.

It's like saying 'why worry about these problems, just don't don't use the the internet at all.' I still like paper books and other things and usually spend a day a week off the internet but that doesn't help anyone who's trying to solve an internet problem, does it?