Helio Gracie put out a book about 24 months ago that is a very expensive, hardbound book that was highly promoted and touted to be the one source authority on all that is BJJ.
A good friend of mine gave me one as a gift so I was very anxious to recieve it in the mail.
It was what I expected which is 101 ways to pass the guard, or 50 ways to do a triangle choke.
It was not.
Helio points out very carefully and intentionally that BJJ is more then the sport.
The book is much of what we see in most TMAs. Knife, stick, weapon attacks. Scenarios on the street. I'd say 2/3rds of the book deals with common stand up encounters!
Many BJJ schools (most i'd say) train for sport jiu jitsu. However, in my experiences, you spend 90% of your time learning principles of center, weight distribution, balance, fulcrum, vectors etc.
Why? because that is what makes BJJ so darn effective! and why at 42 I can do it with a 20 year old and be fairly evenly matched when skill negates speed, strength, and weight!
BJJ I think puts very little emphasis on self defense because it is so principle driven.
We have a saying: Position before submission.
If you can exercise the correct principles (position) then the submissions, arm locks, and "self defense" moves...are a natural progression as the next step.
I think this is what also makes Judo so good it drives home the principle of kuzushi.
I think this is what makes aikido so good as well...it drives home the principle of kuzushi! (well properly executed aikido that is