Even non-theoretical fighters have tons of theory and technique to talk about. Go have a look at any MMA forum.
By the by, I do agree that the talk of structure or body structure is somewhat odd, because it really isn't that complicated of a subject.
"I don't know if anyone is known with the art of "sitting on your couch" here, but in my eyes it is also to be a martial art.
It is the art of avoiding dangerous situations. It helps you to avoid a dangerous situation by not actually being there. So lets say there is a dangerous situation going on somewhere other than your couch. You are safely seated on your couch so you have in a nutshell "difused" the situation."