Chintothe points LF underscores in his recent post have also been stressed by Simon O'Neil, in his excellent mini-essay `Taekwondo as a kicking art', who notes that
...The origins of modern Taekwondo as a predominantly kicking style can be found, among other factors, in the Korean peoples innate enjoyment of the method. A large, vigorous people by Asian standards, their physique and temperament seem to lend themselves naturally to wide, sweeping circular movements and leaps.
This tendency was embodied in Taekyon, a combative form first named as such in the early 19th Century... the limited historical evidence that is available suggests that it was essentially a recreational or tournament activity, in contrast to the other arts already mentioned. Bouts took place both informally, to settle disputes, or as part of organised youth festivals. Contestants would attempt to knock each other down using kicks, sweeps and throws. Wide, circular and spinning movements were favoured over linear techniques, and kicks to head level were assigned greater value than lower kicks. Taekyon was outlawed by the Japanese occupying authorities in the 1920s and teaching of the art all but disappeared until a resurgence in the late 1950s.
Taekyon can be seen, however, as a kind of culmination of the preference for kicking technique in Korean martial arts. ...In fact, in the early- and mid-20th Century, Taekyon even enjoyed the dubious honour of being a preferred streetfighting method of thugs and gangsters. The need to defend against these kicks is quoted as one of the reasons why Choi Yong Sool, the precursor of modern Hapkido, began to incorporate kicking technique into the Daito-Ryu Aiki-Jutsu which he had learned in Japan.
Pioneers of American Taekwondo like Jhoon Rhee and Henry Cho included a wide range of high and jumping kicks in their syllabus, despite teaching what amounted ... to a Koreanised version of Japanese Karate.
So on O'Neil's view, it's not so much that taekyon itself was a direct precursor to the modern KMAs as that it was simply an expression or manifestation of a particularly Korean fondness for kicking methods which became manifest in various avatars of MA in Korea, including the latest round based on Okinawan and Japanese methods. (And maybe not even particularly Korean per se: there's some reason to believe that modern Korean MAs incorporate a use of kicking and leg actions which, from ethnographic sources I've read describing northern Asian and (sub)Arctic cultures, seem very widespread over a vast region which includes Arctic Siberia, Kamchatka, what used to be called Manchuria, Korea and possibly Mongolia: kicking and leg-wrestling competition, conspicuously absent from what we know about ancient China and Japan). The crucial point: Koreans (and maybe other long-time residents of northern Asia) like to use kicking techniques for their own sake.
This affection for leg methods had important consequences for the development of modern KMAs: O'Neil goes on to suggest that
In the second half of the 20th Century the martial arts in general have undergone a transformation from the simple, unspectacular and often brutal self-protection systems of the past to the globally accepted and commercially attractive mass recreational disciplines of the present. Taekwondo has been especially forward-looking in this sense, remaining relatively unified in its goals (in comparison to other arts) and seeking international expansion and recognition as a bona fide sporting and educational method.
Naturally, any such initiative requires distinguishing features in order to establish its own identity in the public eye. One of the ways in which Taekwondo was made to look less like Japanese Karate was to take advantage of the wealth of native Korean kicking technique, and to emphasise this aspect within the existing framework. With time, kicking grew in importance in competition Taekwondo and featured more heavily in the hyungs and pumses than in the older patterns. As a result of the growing popularity of the tournament sport in particular, a large part of regular training is taken up by kicking drills and physical conditioning to enhance kicking ability.
Remember also that if you're going to use kicking as a major part of your SD arsenal, you need to train it in a way that you don't necessarily need to do with hand techs: there are balance skills required for kicking that are not issues with the upper-body skill set that TKD shares with Okinawan and Japanese MAs, but which are very much at issue if you want to add effective kicking to the arsenal. This is something both LF and I have I think suggested earlier: if you're going to use kicking, you need to train some difficult balance and accuracy skills, and those skills are not routinely reinforced in other domains of normal activity. There are all kinds of everyday activities, games, sports and so on which both depend on and develop eye-
hand coordination, but the use of legs, and independent manipulation of legs in good balance, to deliver full power, isn't really characteristic of too much that we do, either in sports or otherwise, on a day to day basis.