That if someone who knows he has clean UTXOs simply wants "a little" privacy without the taint, Wasabi would be the better choice than choosing a mixer that will comingle his UTXOs with Mr. Heroine Dealer's UTXOs.
I disagree. People who don't care about their privacy don't normally look for privacy improving techniques in first place. Besides what you are saying is just an illusion of privacy not actual (a little) privacy. If anyone just wants mixing (eg. they want to prevent regular people from knowing their coins) they could just use the centralized exchanges they are already using to do that.
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?
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.