Yes, yes, Stallman did many good things, he was right about a lot of things, and we are all indebted to him, but... "The Leader of GNU Projects" is not an award or honorary title. It's an actual role with expectations.
The question is not how much work Stallman has done in the past 20+ years (few will have an issue with that) - the question is whether having Stallman at the helm of GNU benefits GNU projects, right now.
He created the free software movement, created GNU. We're standing on his shoulders, only now (after 20+ years of standing on his shoulders) caring that yeah, he's not a perfect person we had hoped for.