I am treatment free because I have never found a reason to treat.
I have never seen a mite in/around/near my bees. And yes, I do test. I also do not even know what a SHB looks like. The only things I have seen in my hives, other than bees is: a spider last week, and an earwig, also last week.
Give it some time. I went for a year-and-a-half before I found mites.