That will hardly happen, as it would confuse many users, give support extra work and have the developers maintain an old feature that has been replaced. You’d better get used to the new situation and find your way to deal with it. To me, the solution suggested in another thread with pressing command after starting dragging a task to another tag was elegant. I wasn’t aware of that possibility, and it sounded like a solution for you. But if I understood your answer correctly, you weren’t satisfied with it deleting all tags, as if you would like to have multiple tags after all. If you used contexts for prioritizing, you may also try my suggestion with less use of contexts/tags, and more use of ordering tasks by dragging, which is now possible in perspectives (if you have the Pro version).
Indeed, pressing the Command key before dropping onto the new tag works like a charm in OF3 for Mac! All previous tags are removed from the action. It works with a selection of multiple actions too.
