Do you think that it is a must for everyone to use a bitcoin mixer? Why and for what purposes?
I've never used a mixer, I don't find it useful.
If I don't reuse (much) the addresses I should be safe. If I want to hide anything I use anonymous currencies - in my case Monero - but actually I have nothing to hide.
I don't see why I should rely on an imperfect (and costly) solution like a mixer.