It's not about complicating the system, it's about allowing people to obtain a higher level of privacy.

Nothing prevents me from scanning the blockchain for addresses containing the common chip values, where it's a piece of cake to differentiate between mixer owned addresses, and addresses containing regular transactions.

If the chip values would be completely random, or say 1/3 random, it would make it far more difficult to potentially link certain transactions to whatever person ~ it's just a suggestion after all, let's see what ChipMixer has to say.