The emotion is pretty much always on one side of these issues. I don't get emotionally involved in buoyancy control devices. I know it is part of the mantra that if one doesn't prefer the BPW, it is due to inexperience or ignorance rather than a legitimate and valid preference. That just isn't true. I am not trying to shake anyone's faith in their belief that there is only one BC and the backplate is his messenger, but for those not committed to the belief system, it is true that there are other types of buoyancy devices than the BPW that work better for some people and some situations. If one feels happiest in a BPW, then by all means that is the best choice for that person, and certainly it is valid for anyone looking for a BC to consider the BPW along with other systems.
I think what really happens a lot is that some people get introduced to diving / trained to dive in the entry-level wrap around BCD with weight belt and they find those things uncomfortable and inefficient. They are then introduced to a BPW and really like the effects of back inflate without really appreciating that there are back inflate BCs that offer the same benefits plus a more user friendly harness/pocket/weight design and often better comfort due to padding and articulating straps, etc. Granted, if you can't find a good fit in a BC, a BPW with a crotch strap may be what you need, and if you need to be able to use one device for your wetsuit and your drysuit and/or with sidemount, doubles, etc., then a BPW may be what you need. Like many others, I find my back-inflate BC very comfortable and have no trouble with trim or getting neutral. I need weights to dive, and weight is provided free where I dive, so I don't need to take lead or steel on the plane with me. I could go on, but there is no point.
So tell me, if my back inflate BCD fits me well, offers all the lift I need, is comfortable, works well, is reliable, meets my needs, is easy and light to pack for plane travel and easy to get on and get off in the water when needed and I can afford it, what am I missing by not having a BPW?