People who don’t desire anything beyond a normal, ordinary life, in my opinion, don’t even think about things like cryptocurrency mixers.
Here I categorically disagree. Every bitcoiner should think about
BTC-mixers. Why? Because of the pseudo-anonymous nature of this asset.
What most people do and what they
should do aren't necessarily the same

Most people don't care about privacy, and they'll tell you they have nothing to hide. That's not true, but life is a lot easier if you don't care about privacy (until it's too late).
It depends on how far they are willing to go in the context of privacy, which is by choice.
Privacy is good, yet I believe most people are inclined towards it already with various measures they deem comfortable enough for them. Thereby, see mixing as another mile they are not so willing to take, which I also believe is not a must.