Once you get out there and put a number of dives under your belt, through casual observation of others, you'll begin to understand where some of these seemingly silly courses began their evolution. For some, skills come easy and are common sense, for others, that same skill may seem an insurmountable challenge and take hours of practice, and yes, even a specialty course. If your bouyancy skills are beyond reproach, it would be silly to take the PPB course, yet there are plenty of mud puppies yucking up great vis conditions, or then there are the folks who slam into the bottom and then over inflate their BCD and shoot to the surface only to repeat this activity a number of times. They may not know about the PPB course, please let them know. Take what will advance your skills and knowledge and that also pertain to the type of diving you wish to do, certainly Trimix will not benefit your tropical shallow fish watching adventures. When I began my journey into diving many years ago, it was the boot camp mentality, a big challenge, but this does not bode well with the common crowd and therefore prevents many dollars from flowing into the scuba community and the profit driven organizations. Many courses are a product of the profit driven organizations and the fact that for many, diving is very unnatural and suffer from the boat anchor/polaris missle syndrome. Glad you've joined the community, you sound like a natural, please be patient with those who struggle with the simplest of tasks like peeing off the side of the boat without wetting themselves, they are out there in abundance and usually need the boat diver specialty.