Got a Real-World Weapon, Armor or Tactics Question? Mk. XXV

[wolflance]

A new, probaby stupid question:

How will the existence of "fantasy martial arts" - the kind that allows people to leap high, punch someone inside plate armor to pulp without damaging the armor, and cut through stone with ki-enhanced sword etc, affect pre-modern warfare, equipment, tactics and fortifications?

(for the sake of discussion, let's assume the pinnacle of this fantasy martial arts is roughly comparable to a low level naruto ninja without fancy ninjutsu - a young Rock Lee basically)