In some markets at least, like cars, this blandness is a sales optimization. Strong distinct colors are more likely to block a sale than bland generic ones. It

In some markets at least, like cars, this blandness is a sales optimization. Strong distinct colors are more likely to block a sale than bland generic ones. It may not be exactly the same in other markets, but there's still a cost to offering additional color variants. It's a cost optimization to offer the fewest colors that are appealing, or at least aren't objectionable, to the widest range of potential buyers.