No, it's not really new to me, but I'll still find roots that way all the time. It will take me places that my ear wont take me most of the time. Like with the same approach, it might make me think, hey maybe I'll try some kind of polytonal mumbo jumbo and using the same roots go:
http://www.bellmusicproductions.com/clientdownloads/mty.jpg
but now I'm seeing a Bb triad with 1 on top and subbing 2 for 3 over a Gb triad w/5 in the bass to a C triad over a E triad but I'll sub -7 for 1 to a D triad over an Eb and I'll sub 2 for 3 again. It's a good way for me to find places to go. Guys like SK, Marino, Dave, and Beeboss can do that without thinkin' about it and just go there. Me....I've still gotta think about it, try and understand what's happenin', get my ear use to it, and under the fingers. I've gotta a ways to go. Fun stuff; this music.