The end result is the same.
Working without a specific mask texture, makes jiust one less texture to load, one less texture to worry about.
And? The Poser node system can do it automatically, so why not use it?

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!