The more specialized a systems is, the less ideal it is for a beginner.
To continue with the school analogy:
Advance calculus is only practical when you know base calculus and base calculus is only practical when you know basic math.
Start off a beginner with basic and natural fighting: kick boxing with grappling and ground work.
For the VAST majority that will be more than enough.
For those that continue and want to learn more, that is when you go into specializations.