You are correct at least from my experience, the wing tape goes completely around the wing. This greatly strengthens the wing joint. I don't know as I would build a plane where the wing halves are joined together without doing a full taping. I know some ARF's for example don't call for the use of fiberglass tape when joining the wing halves, but since I don't assemble ARF's, I can't speak from any experience along those lines.