Yes San, this all makes a lot of sense. It would be fun to take a color class like you did! Probably most of us already have some idea of what makes us shine. For example, I don't need to drape fabric to know I will look awful in yellow and orange and perk up in blues and greys, just from trial and error over the years. It now makes sense why I felt so blah buying brown when it was so "in" a few seasons ago (remember how much there was around - and no grey practically?).
One thing I never realized was that winter and summer can share colors, as can spring and fall. Now it all makes more sense!
My mom shares my coloring and I notice that she now looks great in some of the softer shades of "summer" - pink, for example - that I don't prefer. It's fun that there's a spectrum to choose from.