My kids (neurotypical) don't just abstract and don't draw like untrained adults. They raw something completely different then what they like to look at. The brain also develops oddly. I guess this also depends on what age we talk about, but before 6 years old they have those typical mistakes where kids basically can figure out square, but can not figure out rotated square.
But mostly, it is not just about primary colors. It is more of preference for bright (primary does not matter) and simple - single color with no shading is better then realistic shading. Two color shading is acceptable, but does not seem to add to experience.
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My kids (neurotypical) don't just abstract and don't draw like untrained adults. They raw something completely different then what they like to look at. The brain also develops oddly. I guess this also depends on what age we talk about, but before 6 years old they have those typical mistakes where kids basically can figure out square, but can not figure out rotated square.
But mostly, it is not just about primary colors. It is more of preference for bright (primary does not matter) and simple - single color with no shading is better then realistic shading. Two color shading is acceptable, but does not seem to add to experience.