I agree with Nemrod, in 40 years, I started with double hose, plate with no floatation, and have used almost every combination that has come along.
From reading the posts on Scubaboard, there are more new divers using BP&W for appearance than for need. This survey shows a large percentage of BP&W users, but in freshwater diving in 4 states in the midwest, and Mexico Caribbean, it is rare to see a BP, except for a few advanced divers. . . which they are using them because it serves their needs.
I'm not against BP&W, I've used them for double and triple tank configurations where I had long bottom times, usually working. I've used back inflate and jacket styles since they were introduced in the mid 70's. There are complaints from some users of jackets, If they don't get a proper fit, that's true. There are many brands, and some of the imports and some of the cheaper jackets don't fit properly. Like all diving equipment, to get a good fit, you must dive with it to try the fit.
BP&W is the best piece of equipment, if you are diving multiple tanks or diving a drysuit, or working in a rough working dive that will destroy "normal" dive gear. All of these are beyond most divers experience.
Having taught, and watched over divers for many years, we all want to help the beginners. Most of these new divers won't stay with diving to become "advanced" and pushing them to use "advanced" gear will shorten the time they'll remain diving. If you can advise someone who shows interest in advanced diving, go ahead and recommend what you use. But look at the gear, most manufacturers make, what most dive shops sell, and realize that those are the configurations best for most beginning divers. BP&W are a small fraction of the floatation market, usually "home" made or small company manufactured.
A huge percentage of divers will only dive on vacation, only dive single tanks, only dive in mild temperatures, not go deep, not dive wrecks, not dive under ice, not dive caves. . . If you're a diver that does all of these things, or some of them, choose what you need for your diving profile. But don't push a beginner into looking "Pro" before they need to begin advanced training.