You don't know a back dash, though. Back dash in DOA is pretty much just for avoiding some situation that can involved you getting caught in a other wise guaranteed situation. Unless you have a mechanic that depends on the back dash, you always should be depending on the KBD. And DOA's KBD is godlike.
Like who? I mean I use characters like Rachel, Tina and Lisa and their spacing/footsies are pretty damn good. Even Bass has an awesome KBD (considering it's pretty much the same for all characters). I don't see why a slow character would want to dash backwards anyway since they want to be in your face, unless you just want to create space which the KBD is for anyway. Chaos let me come slap you. SLAP YOU!
LOL I know you're talking about regular back dash. What I'm saying is most situations that require a back dash aren't many, since you should only be using the KBD to create space.