Maybe I didn't do a good enough job demonstrating how common it is for backwards compatibility to be broken. You're right that many devs value stability—not just clojure devs. But there are also many communities where breaking stuff is normal. This is addressing the latter, obviously.
Well that's just slander as far as I'm concerned. Of course we other non-clojure programmers believe in backwards compatibility. What a crazy thing to suggest that we don't.