If it does, then you would be able to express a race condition with it.

EDIT: I re-read parent comment.

>> the biggest advantage to using tail recursion over vanilla loops is the ability to keep using persistent data structures without any (apparent) mutation.

Yes

>> at least with Clojure's loop/recur stuff it is kind of cool to be able to keep using persistent data structures across iterations of loops

There's the implied mutation.