His point seems to be 'don't go near the scary end of colour and you're all good: stick to pastels and use a million shades of nearly the same colour. I don't

His point seems to be 'don't go near the scary end of colour and you're all good: stick to pastels and use a million shades of nearly the same colour. I don't think it explains good colour use, vision differences (e.g. Tetrachromacy) or why artists can sometimes seem to make horrible colours work really well. Better gradients does not necessarily equal better colour.