The design is streamlined and efficient underwater. As indicated above it is uncluttered, compact and easy to transport.
It is also uses a modular systems approach and can be readily adapted to different condtions by changing wings, pockets, weight systems, travel bands, tank bands or single tank adapters, etc.
There is a thread on the site currently for an Aquatec wing BC. It is almost identical to the used late 70's Scubapro back inflate BC I started diving with in the mid-80's and is generally very similar to a BP/wing except for the weight of the metal plate and the potential for using peripheral mounting holes on the plate to attach items. In some ways the "modern" BP/wing brought things full circle with a return to an idea that started about 30 years ago.