Anonymous coins are not such popular like Bitcoin and not many shops accept anonymous coins. That is why mixers becomes more popular.
I would say that there are supporters of the use of anonymous coins, and there are those who prefer bitcoin mixers. In any case, when making a purchase with delivery, the buyer deanonimizes himself.
There are supporters of anonymous coins and they are used for special reasons. For example, Monero is used for casino and for games but Monero is not used everywhere.