My girlfriend and I just completed our OW certification and were considering our options on BC equipment. We both thought the BCD's we used during the course were too much equipment and looking for something simpler.
Good for you. Simplify early and often.
My girlfriend wants the Transpac or the QPac by OMS. Either way both our choices seem unconventional when we tell our LDS what we want in equipment.
Those choices may be a bit 'unconventional' by some standards, although I suspect the degree of 'unconventionality' is possibly also a reflection of the particular area, and the specific shop. If your LDS is not a dealer for DR, or OMS, it isn't all that surprising. And, even if they are, they may carry only certain items in each brand line. I must confess that I am not a particular fan of the IQ Pack as a BC for someone who is looking for 'simple'. So, I might also seem reluctant to endorse it for someone who asked about it. The same goes for the TransPac, even though I own one that I use for sidemount - too much material, not very adjustable. But those are personal preferences. If your girlfriend is looking for 'simple' she can do better. The first time I put my then 15 yo daughter in a simple SS BP with a one piece harness, she didn't like it. (The first time she tried calamari, she didn't like that, either.) The second time was OK. The third time she became a convert. (And, calamari is now her favorite appetizer.) Just because more jackets are sold than BPs is not necessarily an indication of preference. And, I am not saying there is anything wrong with a jacket, as I use one for pool and OW checkouts, because that is what we have in our pool and rental inventory and I gear up like the students.
I just don't understand why these instructors want us in a jacket style BCD so bad.
I don't think they actively want you in a jacket BCD, as much as they are probably unfamiliar with a BP/W themselves, are therefore hesitant to recommend them, and may work in a shop environment where BPs and wings are not regularly stocked. While there may be a commercial motive as some suggest, I think the more likely reason is simply lack of familiarity. I work in a shop where the owner is a very active technical diving instructor, where six of the instructor staff are 'tec certified', and where doubles rigs, backplates, TransPlates, TransPacs, etc, are on display. But we have at least as many staff, in fact more, who are not 'tec certified' and who have never used a BP/W. One of my instructor colleagues, who went through IDC and IE with me and is a superb instructor and a good friend, dives a Zeagle Zena - great BC for female divers I am told. We recently had a female DM candidate who wanted to update her gear and I suggested she consider a BP/W. My instructor colleague advised her against that, and recommended the Zena, which the DMC ultimately purchased. I don't think that was a bad choice at all, but it illustrates a situation where an instructor, who had never used a BP. advised against it (or, more accurately, advised in favor of something else) because THAT (BP) WAS SOMETHING SHE WAS NOT FAMILIAR WITH.