I think (as most everyone should know by now), that it is the core skill that boxing training provides that is the important aspect. Forget the "sport" of boxing. You can use "dirty boxing" if you want to.

It's that "engine" or delivery system that is the essential element that I believe a person shouldn't be without. Hell, add your kicks, elbows, eye gouging, hairpulling or whatever else you guys like to do (fight like girls, lol). Just don't be without that ability to intuitively counter-punch or that ability to slip shots and be evasive while returning your own.