I mean, for rainbow warriors or color enthusiasts like such as @zaximillian or myself
I think the Classic boxes are a terrible deal as they are a way to force Rainbow Warrior building as a gateway to buy more brick. Instead, I favor the opposite end of the Classic color design scale from TLG, and that is the Creator line. This is so much so that I recommend this line to all new builders that I talk with at events to gather their initial part collection with.
I am a color *blocking* enthusiast, not interested in the colors themselves. I like working with color groupings and specific proportions thereof, as color blocking is vital for making a consistent set of builds and making the most of shaping and contrast. Individual colors don’t interest me much, unless colors have an inherent function, such as fluorescing bricks for Glow Zone, transparent colors for extra clutch and non-solid effects, or assigning greeble colors. It’s the palette that’s much more useful, and all palettes begin with the Lego core colors (red, white and blue, black and yellow) and “the bleys”, as these colors have the greatest population and variety. Therefore, I cringe at the Classic line, but will buy 3-4 sets of a small MOCable Creator set at a time.