No, we don't need.
People who trust mixers, how do you know there is no logging your ip and input/output addresses on backend?
You trust message "Anonymous/Privacy" on their website?
If even "the most private and anonymous" Proton mail working with police...
100% true. People should have learned their lesson about "mixing sites" a long time ago. Coinjoins keep your funds and data safe, so there's absolutely no excuse for anyone to use/promote/operate a "mixing site".