Oh boy. I didn't want to keep this conversation going but I have to respond to this...Moses, it sounds as if you are saying graphic/visual design can be summed up as technical ability. While this misconception has sadly been perpetuated by some mediocre design schools/programs, it is a dangerous fallacy.
Actually I was trying to say quite the opposite. It's the theoretical toolkit I was referring to, but that theoretical tool kit can't be completely divorced from practice. That's why I keep emphasizing the tools. Different tools afford access to understanding design in different ways. In my thinking this goes for any field of practice, and the best thing you can do as a practitioner is to find time to explore new tools because doing so allows you to not only take advantage of whatever snazzy tricks those tools afford, but to reframe your conceptual base by approaching practice from another angle.