This has been a very interesting discussion from an outside perspective. Not that TSD is THAT outside, but we are definitely down the evolutionary ladder from TKD.
Well, that can be taken two ways... if the `evolution' in question is a hyperspecialization for a very, very limited niche, then it's probably an evolutionary advance not to go down that road! So a case could be made that you are higher up the evolutionary ladder...
Anyway, what I want to know is what the intent of the Taeguek forms was supposed to be in the first place. I suspect that they were originally designed the KMA masters thought would be good for self defense. Basically, they mimicked japanese karate without really understanding what those moves were really used for.
I don't think of them that way. They replaced the Palgwe forms, which have the stamp of the Pinan/Heian katas all over them. The Palgwes contain whole chunks of the Pinans, or small recombinations with minor variations. The Taegeuks, I'd love to have a chance to bet big money on, arose as part of the Korean nationalist `purge' of identifiably Japanese/Okinawan elements from TKD forms, although there are many sequences in the Taegeuks which are still very reminiscent of the O/J kata. TKD, after all, comes into being in the Kwan era as the Korean development of karate, and you kind of have to play the cards you've been dealt. And those cards were almost purely Shotokan techniques, at the outset. Not that they don't have SD content; Simon O'Neil is currently writing a book much of which is devoted to showing Abernethy-style bunkai for them, and in his hands, they look like scripts for very effective CQ fighting along the usual lines we're familiar with from that group. But there's a strong current of opinion that they were created for essentially nationalist political reasons.
This is why the development of these forms is so interesting. There is no doubt about it, TKD is developing into more a sporting format. So, if these changes in the forms aid those goals, from a pedegogical perspective, then the forms are more closely matching the overall objectives.
What O'Neil's work suggests—and much of the bunkai interpretation in his Combat_TKD newletter demonstrates very convincingly; he had an article in a 2005 or 2006 TKD Times which presented a kind of overview of his results—is that you can extract lean, mean street-ready apps from the Taegeuks just as you can from the Pyung-Ahn/Pinans. But the higher stances lead a lot of people to think of them as a kind of orientation program for WTF-style sparring. My intuition is that those stances didn't start out so much for that purpose as to be a very obvious, marked contrast to the extremely low stances practiced in many Shotokan schools (the Okinawan stances, interestingly enough, seem to have been a good deal higher, or at least that's what karate historians I've read, people like Mark Bishop, have concluded).
Think about it. There is no use practicing low stances if you don't practice throws or joint locks A LOT. If 90% of your techniques are kicks that are supposed to be used in competition, then it would seem to me that the intent behind the form is finally matching the ultimate goal...
What do you think?
Well, I think that we know that the point of the low stances was to emphasis driving weight into a tech to unbalance your attacker or break a joint that you had in a pin or a lock as per the `smart' bunkai for those kata. But as you yourself have pointed out, UpN, and as Master Penfil has stressed as well, the Kwan founders probably didn't have more than a rudimentary picture of the original intentions behind the kata they brought back as the first KMA hyungs, so they probably weren't consciously saying, `Well, we don't need that low stance rubbish because we're just going for high point-scoring kicks to the upper body from four feet away and have no interest in pins, armbars, locks or other stand-up grappling techs.' If you and M. JSP are correct, then their rejection of low stances would very likely not have been on the basis of some idea that `the point of such stances is really about weight projection into a controlling tech but since we aren't doing locks and pins, we can just drop them'. It seems to me more likely that the motivation was some kind of symbolic political statment: low stances are a hallmark of those guys, so just remember, we're not them!