Performing an Iaido kata with great intent will have no greater effect upon your character than say, practising your skateboard flipperty-twist jumps with your full-spirited intent.
I disagree with this statement. Iaido and skateboarding do share elements of danger and physical expertise. But there are things they do not share. Iaido and other MA are done in the context of battle, with the attitude of directly overcoming another human being. This mindset is not duplicated by most other pursuits you refer to. There is no interaction (even if it's just the imaginary kind as in kata - the attitude is still there) with another person, another
will. I believe this context offers a greater opportunity for "self-culitvation."
While there is elation in winning at any pursuit, I don't think there is the concept of
zanshin commonly present in pursuits other than MA. Then there is the historical tradition behind TMA which can instill a sense of responsibility and respect for the art. One can also find in TMA moral and philosophical teachings (such as
the Seven Virtues of Bu or the
Eight Precepts of Quan Fa.) I don't think skateboarders are commonly conversant in such things.
Another quote from Gyakuto (somehow the quote format disappeared.):
"...itās the
person engaging in the activity that decides what they get out of their pursuit."
I agree with this 100% and basically said the same thing in an earlier post, here. But there are opportunities in MA
for those wishing to avail themselves of them - opportunities, as I've tried to illustrate, that other pursuits do not offer. For these and other reasons, IMO, MA (especially TMA) are in a class by themselves concerning self-cultivation and depth of benefits.
The casual practitioner may not appreciate the essence of MA - its true and total value are realized only after many dedicated years into the journey. It is more than just living the lifestyle, it is the
"do." (Don't mean to sound dramatic, but trying to be as concise and illustrative as possible.)
Poster's note: I have spent time considering that my views are derived from
hubris or brainwashing over the many decades of my MA study, and conclude they are not. Karate is NOT a religion for me and I'm no fanatic about it, but I know the effect it's had on my life and cannot deny it has contributed a lot to who I am.