I disagree
wax on..
The way I see it, most variations of martial arts were borne out of people thinking "he's doing it wrong".. and that, in turn, is a thought that starts by the consideration that whatever it is that "he's doing wrong" doesn't include this or that, or should include this or that
.. and the "this or that" may be anything from singing the national anthem to bowing to the flag, from bowing to your opponent to taking a deck-chair to his face or praying the spirits for protection, from playing a berimbau to learning physiotherapy and anatomy or meditation techniques... in other words, radical rethinking of purpose, form, style, phylosophy etc etc.. and these can be grouped under an identical definition of martial arts only if you go as broad as "pretty much everything which can potentially put you in hospital"..which is very zen, maybe, but also rather silly.
.. wax off