I do not intend to be negative in any way towards "jutsu" for certainly it's value in combative trainning is without question. I would also agree that "many" whom study "Do" (the way) have no idea at all what any of it means other than showing up and practicing the physical aspects of the arts.
As for Zen, Toaism, Buddhism and other "Eastern Philosophy" i understand the "non-attachment" of catagorizing things however, when one tries to explain their opinion or view regarding any of it, there will reflect some attachment. Understanding it is one thing, living it quite another.
I have studied some Jujitsu and Aikido which to me was "all" technique. Not that it is a bad thing. I only imply that in my study and persuit of the "way" or "Do", i find a balance of physical, mental and spiritual energy in "breathing" and focusing in "kata" and in some other aspects of practice, that i did not reap the same benefits from in "jutsu".
Maybe as i am creeing up in my mid fourties, i value my depth of understanding in "Do" that there is more than just "technique" to be mastered. There is the inner development of the self, that is a life long journey.
It is my opinion that many practicioners of Karate-do move on only after having attained lower Dan ranks because they do not fully understand what it is about. But, on the other side of that, i can also appreciate the "young buck" who is looking to develope his "fighting" ability to the utmost effeciency. Incorperating, karate, grappling, jujitsu and whatever else one desires.
However, to master any one system, it is a life long journey. Cross trainning surely is helpful to know and/or understand how other styles work. We all have some weaknesses in our styles and we should not think that we are invincable to anyone at anytime.
With all respect,