I would be very interested in how many instructors on SB regularly put students in a BP starting with confined water, or even starting with the OW checkouts, and what your experience has been.
I worked at a PADI 5 * IDC Center last year that also is one of the major TDI Instructor Trainer facilities over here. So there was plenty of "
tech(yes, I know BP/W isn't just for tech) equipment" on display in clear view of the customers. Quite a few instructors there are TDI instructors and were doing both rec courses and tech courses. At no time did it occur to anybody there to sell a BP/W to a recreational level diver, except to one customer, built like Justin Bannan, who used doubles to just go on a regular recreational dives. Talk about SAC...
I would not contemplate putting my students on a BP/W for the following reasons:
1. I want them to train on the gear that they are going to find for rent with me or any other place they go diving.
Worldwide.
2. I don't believe in rushing or cajoling students into buying equipment
(except mask, fins, snorkel and booties);
I would rather they spent the money on diving and training and made up their own minds about equipment choices. I also am a believer in divers buying their equipment one piece at a time and
real slow with an informed opinion after having spoken to other divers and spent some time on Scubaboard.
3. Buoyancy, IMHO, is not just about attaining perfect horizontal trim. In fact I like students to get buoyant in any position.
4. I have a "surface safety issue" with BCDs and BP/Ws. Yes, this is a pet peeve but I take it very seriously. It's not just about the diver knowing how to handle his BP/W on the surface to not go
smack face down but about other divers knowing to handle a BP/W in case of an emergency.
OTOH, I think BP/W could and should be introduced as an adventure dive (AOW) and a specialty, just the way Dry Suit is.