Well, to beat a grappler- it is a great deal. But this is another story.
I meant that some instructors teach things that are pointless from any point of view. They donīt teach you how to keep the right position nor do they help you in self defence.
I think that this division of techniques into traditional and effective ones is correct only to some extent. Of course, at the very beginnig you have to do every technique from the katate tori, even though you know that hardly anybody will attack you that way. But how would you explain the point of doing hanmi handachi waza?