You're not getting the right context, and missed the actual point completely. If you're merely a casual user/newbie who simply wants to use a mixer without the risk of tainting your coins, where can you go? What can you use?
Every time a casual user or any other type of user sends bitcoin or receives payment on their wallets, they are risking to taint their coins. Using "compliant" CoinJoin pseudo-privacy solutions like Wasabi Wallet won't help them escape being touched by dirty coins and will make things even worse because, from the standpoint of chain surveillance companies and other parasites, any CoinJoin transaction is always more suspicious and risky than any non-CoinJoin. It is because they deem suspicious everything they can't trace.
Although you're also right, the simplest and most efficient solution for users who are, not criminals/have nothing to hide, are not mixers but centralized exchanges.
A centralized exchange is the simplest and most efficient way to swap your clean coins for taint coins
legally.