It's not impossible to use properly, but it requires time and money. Just to enter the Samourai mixing pools, for example, costs ~$5-270, exclusive of Bitcoin miner fees. Mixing can also take days. Mixing may provide the intended effect for some people, but it's certainly not something for non-enthusiasts. Plus, Chainalysis and other companies will just mark the whole mixing pool as higher risk anyway and flag those deposits with exchanges, even if they can't trace it.