I know the two new watch faces use the crown for functionality, most likely ruling it out from working there. I also know that they made Time Travel opt-in in OS 3. Can you still enable it for the old watch faces, or is it completely gone now?
It's 100% still there, but I'd expect it to be removed before you know it. The new Explorer face doesn't support it, and for no apparent reason. The crown doesn't interact with that face at all, yet Time Travel just doesn't work. Unfortunate.