In defense of martial arts I want to note that in their case the mentioned key observations for epistemic viciousness are not independend and partially unavoidable.
Especially the "deference to famous historical masters" point is no more than a logical conclusion of the "we live data poverty" point:
Until less than a hundred years ago people would risk their health (even life) in fights to establish the superiority of the brand of martial artists they espoused. Not to mention life circumstances in general, which more often than not included more or less regular violent conflicts, which usually meat hand-to-hand combat (as opposed to guns).
These people did certainly not live in data poverty regarding the efficacy of their techiques, hence it is fair to assume they were (at least on average) better fighters than today's martial artists.