That's a lot of generalization.

Many of the high ranking martial artists I've met have been very open and often practice aspects of metaphysics. Rekki, crystals, meditation, yoga, etc.

I understand that the vast majority inhabit the "tiger phase", to be expected. Yet, a great number of long in the tooth masters remain in study.

I say this not to disagree with your point, rather to offer the idea that these practices are being pursued vigorously.