“I don’t think most of us are waiting until a move is complete”
You assume standard 3D game used behavior tree. And of course you are right.
But in many other type of games and projects a lot of objects have their following path. Many people don’t use behavior tree (very bugged) at all.
In the other way, I think some people don’t even notice this kind of obstruction in movement component exist.
BUT: i’m still waiting some Epic guys will see this post and add task to “to do” list for future unreal version