Yep. Ironically, BTC mixers seem like they'd be quite poor at the job of actually mixing because unlike more sophisticated looking layering activity, it doesn't

Yep. Ironically, BTC mixers seem like they'd be quite poor at the job of actually mixing because unlike more sophisticated looking layering activity, it doesn't actually mimic legitimate transaction activity which could otherwise slip under the radar. On the contrary, it sticks out like a sore thumb and because the blockchain is immutable, has been used by the authorities to trace less sophisticated actors.