Can you please elaborate on this?
I always thought the the upright stance which is enforced in Judo was for another reason.
Yes, its been "promoted" but until the new rule change it was not enforced.
The reason its enforced its because its more defensive in nature than the natural posture. Imagine that shizen tai (natural posture) are the open guards while jigo tai (defensive posture) is the closed guard or 50/50.
The natural posture allows more attacks because you can move more quickly and freely around, judo its heavily dependent on footwork for imbalance, being able to move faster allows more offensive options.
I always use natural posture, because i felt in control of the fights when i had it, i even used a left guard, because i had good counters and defense from attacks from the right but it was left attacks what got me. Kind of unorthodox as most people will have a right posture that defends against right attacks, which are what most people do better.
Using the natural posture for so many years against turned judoka wrestlers have given me a lot of advantage in BJJ, where everyone assumes a wrestling stance. In wrestling its different because the lack of grips limits mobility advantage.
What certain athletes were doing is using wrestling along with judo, which turned their matches into wrestling matches, which were ok, and they were fun when they could turn it their way. It was not the ultimate style, they simply had their style.
This style was also accentuated by the fact that newaza is limited by referees, they simply stalled then shoot and if they failed they turtled up hard until match restarted. That lead to "boring" (in the eyes of non-judokas) matches, and therefore the IJF tried to fix a mistake with another.
IMO if newaza was not limited by the referees, that would not have been a problem.
Another possible theory of the leg ban is more on the conceptual and philosophical side of judo, some people take the soft aspect of judo too literally and shun on anything resembling pitching strength vs strength, defensive posture is associated with strength vs strength and its usually a complex pattern of pushing and pulling from a strong base wanting to make an opening, which is epitomized in the go no kata which is not officially accepted, even though its the oldest.
YouTube - Judo: GonoKata
What some fail to realize is that the Go no kata, its not about winning with strength, its about using strength smartly and its still judo.
""Is there, then, any principle which never fails of application? Yes, there is! And that is the principle of Maximum Efficiency in Use of Mind and Body." Jigoro Kano.
Judo its not against strenght, its not about weak vs strong, its about using strength SMARTLY that means with technique. Its not the concept of using strength what judo its against, its the concept of wasting strength.