Hi,
To get back to the original question, RBSD is often presented as separate from martial arts training in that RBSD is primarily concerned with the pre-fight, the ability to handle the initial assault, and the post-fight adrenaline dump.
Deane Lawler, in his seminars, says that RBSD is designed to get you through the first 3 to 10 seconds of an assault, and then your martial arts training comes in. In fact, other than a few concepts, few RBSD teachers actually teach much in the way of techniques (as you would get in a martial art class), focusing more on drills and the mindset required to survive. It is almost assumed that most people who attend such classes are already experienced in some form of combative system, so there is no need to go over old ground again and again. This is how you can get certified in teaching an RBSD system with only a weekend course (in some cases), as it is principles and drills, not techniques.
Within our schools, we take the traditional techniques of our art, and in our street application, we utilise RBDS teaching methods. So the two methodologies are not mutually exclusive, in fact they are designed to work together quite well. If you have trained a more traditional system for years, you will find that pretty much any RBSD teaching will be quite applicable to your art. The difference is in the strength each gives you... Many "traditional" systems start their techniques when there is a clearly defined attack (and attacker); in other words, when the fight has already started. This can leave you open to being sucker-punched, or simply not aware of when you are already in a fight (by not being aware of the pre-fight ritual and keys of posture/body language etc). RBSD, on the other hand, teaches you very well how to recognise such pre-fight changes, and very good drills for adrenaline-training, however often lacks the technical syllabus of a full martial art.