I've used all manner of slings with my Fita recurve and have used a wrist sling when I shoot my hunting recurve with sights. I found that the wrist sling really doesn't do anything, so when I shoot barebow, I tend to not use one. I find that unless you use a long rod stabilizer, loosly gripping the bow gives much more control than letting the bow's weight rest upon the sling after the shot. With no stabilizer or only a short one the bow doesn't fall right for me to use a sling, and wrist slings are the worst of them all.
TimberBound