It's been a good read so far but no one's brought up the point, that in terms of old-school karate, a student may have only studied 2-3 kata's in their entire life. I'll play the devil's advocate and say, "Do we really need to keep up on our Pinan/Heian katas, a set of katas, that were developed 100 years ago so that beginner highschool students could learn karate?" It's true we can always develop the basics from the "learner's katas", but Itosu created them by borrowing techniques from the traditional katas. Once you've begun your studies as a BB why not get everything from source? I think a lot of people's training suffers by "biting off more than they can chew." Perhaps focusing on a few may be the way to go. How many katas can you really improve on during 2 hour practice, during a year? And as to instructing, I think most BB who have developed some of the more advanced katas, and may have forgetten a Pinan/Heian kata, can take a look book and be able to perform it very well within 10 minutes. Most beginners can pick up a Pinan/Heian kata in a day, how long would it take an experienced practitioner. Just my two bits.