i love that poem, Matt
basically, the backplate/wings puts the air on your back, allowing a much more
streamlined, horizontal position in the water. also, the backplate can be used
as weight to lessen or even eliminate the lead you take with you
in the water. since the backplate spreads the weight over your whole back, it
doesn't affect your trim as much as wearing weight on a belt or integrated pockets.
also, the harness can be adjusted to fit YOU exactly. no BC is ever going to fit you
as precisely as a backplate, because the harness is infinitely adjustable in a backplate.
also, you carry a lot less material with you. the backplate/wings is less bulky that any
BC out there, which means less drag, which means less efort, which means you
use less energy and air moving around in the water.
this is off the top of my head. i'm sure i've left out some things.