Wichey there are lots of whys to bind, i just perefer to keep things poly for the final and sooth bind
There is a way you can bind just the poly proxy mode to have the sub-d surface move with it.. but like i said it is a bit more envolved and sub-d's tent to be harder to move and animate due to the fact the computer has to calculte both sub-d and poly meshes.
I am enough of an artist to draw freely upon my imagination, knowledge is limited, imagination encircles the world. (Albert Einstein)
https://www.artstation.com/kurtb