Bitcoin isn't dependent solely on centralized mixers, don't generalize like that. We already have wonderful alternatives, Joinmarket, Whirlpool, trading XMR back and forth, and so on. And yes, we also have the option to use a mixer, because sometimes it might fit the need best. If someone wants to run such a business, we should definitely not reject them; it'd be completely against the Bitcoin spirit.
If you don't like mixers, don't use them. Simple as that.
People willing to put a target on Bitcoin, this forum, and their own backs by promoting centralized money laundering services for money aren’t doing some great thing for privacy.
Have you ever considered that the intense pursuit by federal authorities to shut down mixers might indicate that they indeed offer uncontrollable privacy? Providing privacy in such a manner is classified as a significant boon for privacy.