And most of them described all the other BCs available as "junk".

Too funny! Or needs! This tripe about the BP&Wings being the "optimal" or "only" solution is myopic at best. It sure makes you sound important though!
I don't think that's the issue though. I have a garage full of BC's. I've used all kinds of stuff and, in a pinch, I can make any of it work.
however, I ended up using a BP/wing because it (together with the rest of the configuration) elegantly solves several "problems" that got to be more and more of a problem as my diving progressed.
You're in Florida but here in the land of winter, we have an awful lot of divers out trying to dive in drysuits or heavy wet suits, an aluminum tank, buoyant padded BC's with integrated weight systems that aren't designed to hold the amount of weight needed in all that buoyant gear. They end up trimmed head up and struggling just like they were taught. They have plenty of d-rings (usually none in the right place), retractors and enough accessories and toys that they should be able to fly the rig to the moon.
I know how to solve some of those problems without a BP/wing but they don't know how to solve them at all.
Some years ago, I spent the weekend with a scubaboard member who was trying to get ready for a dive trip. He had just finished an AOW class and was having a rough time and wanted some help. He had also just spent a bunch of money on new equipment. This expensive BC he had was equiped with a plastic hard pack that didn't even permit any adjustment in the hight of the tank. If you can't get your balast in the right place, you're going to have trouble and it wasn't easy on what he had. There were certainly some skill issues but without spending a lot of time figuring out how to make things work with that junk he had, he would have never gotten anyplace. Some shop sold him that fancy crap and took him on trainaing dives...like a deep dive...and never helped him get the rig functional or even tell him what functional is.
If you don't need a lot of weight and don't have to carry much (tanks, lights or whatever there isn't any reason that a jacket can't work reasonably well. I don't even know if anyone sells one that I would consider bucause most manufacturers seem to want to take a concept that isn't too bad and clutter it up with buoyant pading, cumberbuns, bulky weight pouches, d-rings in stupid places and so on. They mess up the back-inflate BC's the same way. You have all kinds of stuff hanging on you but no place to put anything useful.
Does this stuff represent inovation? I think not. What does a BC have to do? It needs to allow us to add or subtract gas for buoyancy adjustments and keep that gas where we need it and NOT get in the way of other things we need to carry or do. So many of the features we see on new BC's not only don't help with that but they actively interfere.
Do the people that design this junk dive? What kind of diving do they do and are they any good at it?