Well obviously I would love to agree with the title of the thread. I do agree with what Bob said though :
It seems to me that it's better to take in as much as you can of the world of guitar techniques and absorb all of those that will help you fulfill your musical vision.
I was talking to a belly dancer who had just started doing salsa. Although she is a professional in the one style, she feels inadequate in the other. The thing is, both require, it would seem, two different states of being, not just different technique. I doubt that the one style would enhance the other, but it certainly expands her repertoire. I think this applies to guitar styles as well.
I think the technique for classical guitar is mirrored in many styles, but the state of being one needs to be in to produce an amazing classical performance is very unique. While the notes can guide you to the feel of the song, at some point you have to abandon them, like training wheels, and focus on something "other". I think that's why classical guitar is hard, is because there is so much emphasis on the technique, which, once mastered, you need to let go of.