First off, I didn't realize this was in the JKD section, so I apologize if I'm leading the thread astray or stepping outside of my area or something. But I thought I'd jump in and add some thoughts...
Well, I know in our hapkido curriculum there are some techniques that I can do well enough to pass a test or teach to a student, but I don't think I would ever use in a self-defense situation. For example, my sweeping hip throw isn't exactly great. I just don't have much time on the mat using this against a resisting opponent that my instructor, who was a judo player before studying hapkido, or his instructor, a judo master, had.
But who is to say that one of my student someday might have a really great sweeping hip?
well in this example, it sounds like you understand the technique well enough to be able to teach it correctly to a student, and you recognize that it is a technique with a lot of potential, even tho you have not realized that potential yourself. So under those circumstances, I think it makes sense to keep it and pass it to your students.
And then there are techniques that I KNOW I could depend on (if the situation called for that technique) that for ME would be very effective — say a side kick or front kick — but I don't think would work for a particular student.
So, as you said, Crane, "What works well for one may not work so well for another."
but of course you must teach the things for which you are strongest. That is your specialty. Sure, not every one of your students will be able to do it, but some will. But the point is, these are your strong points so clearly you teach them. I wouldn't necessarily decide for a student that he won't be able to use something that you have to teach. That student needs to make that decision himself. But you are good at it, so definitely teach it.
Obviously common sense must step in at times. If you have an overweight, 75 year-old student who is a beginner and has trouble just walking in the door, you probably don't want to start him working on hip throws and jump spinning kicks. Some things are pretty clear in that way.
Here's the question though: if every generation of instructors "weeds out" techinques that THEY don't find useful, eventually the curriculum will be down to just a few techniques.
this is a possible end result, but it fails to consider what else might be brought into the curriculum in the mean time. I guess you gotta ask yourself, what is it you want to practice and teach, and why? Do you want to remain faithful to a system established by someone else, or do you want to focus on the things that are really effective for you? These may be the same thing, or they may not. You need to decide.
Systems do change. Every generation does things a little differently. Sometimes it is just the result of a different body type or something. Other times it is because things have been deliberately changed, or material has been eliminated or new material developed or borrowed from elsewhere. There really is no such thing as a "pure" system. I think it's really a result of these modern Federations and whatnot that have made us feel we need to keep a system "intact", but historically I'm not convinced this was such a concern.
But what if I toss out a technique from the curriculum that one of my students*— or one of my student's students — would find particularly useful?
again, if you understand the technique well enough to teach it correctly, then do so. If you feel the technique is actually a bad idea altogether, or you simply don't understand it at all, then you can't really teach it in good faith. Under those conditions, I don't think it makes sense to worry about depriving a student of something that THEY might be able to use, if you cannot. Maybe someone else can teach it to them and they might find benefit in it. But you, perhaps not.
My opinion is, we should keep our curriculum intact and pass it ALL down — even techniques that we might think are highly unlikely to work. For this reason (in addition to being required to know the material for testing), I continue to train all the techniques.
But on the OTHER hand, for MY martial arts, I do focus on techniques that work for me, that I find useful. The list of techniques I am likely to use in a self defense situation are significantly fewer than I know and train.
I tend to feel the same way, I don't feel i'm yet in a position to decide what, if anything, ought to be eliminated. But I do feel that it makes sense to make your own short list of hot items that really work for you. Those are the ones you get really good at and you rely on. The others you maintain well enough to keep the system together, and you polish them up when it comes time to test again. But the bulk of your training is on your list of old faithfuls.