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People talk about "soul" a lot for older vs. newer sets and I feel like a big part of it is the color distribution. Older sets weren't afraid to get a bit sporadic with it and distribute them almost at random, with individual bricks sticking out more as opposed to large swaths of the model being all one color. It gives it a sense of texture and detail, even when there is none.
Seriously, imagine if Rock Raiders had the same colors, but with Power Miners style color blocking. It'd look awful