Putting it back with martial arts. If saber forms are the various branches of jiu jitsu with BFF and krav and bjj and the numerous other offshoots. It doesn't change that at their core they lean from the original. They have similar guards and core fundamentals. Whilst you don't have to learn the original to learn krav it doesn't change that it is a good foundation. A high level user is certainly able to compete with a bjj grappler or whatever but since the rest develop from it sensibly you still learn basics of it in almost all of them.
I don't need to insult intelligence by translating that to shii cho.. I just would have designed it that way. So that it provided basic and common skills that most of the saber trees provide without going to specific in any particular way. As a universal spec so that it could function easier as a base. Not that it can't as written I just would've done it that way.