Initially, FGMO was the way to go, best thing since rolled condoms; now OA is the way to go.
I appreciate that Glock had mites after fogging with straight FGMO, so he went to oxalic acid, to make sure he didn't lose his bees.
My only issue is that he never tried any way but his way.
It seems to be all or nothing, with no middle ground.
Respectfully, his results are only his own.
Dr Rodrigues used FGMO in conjunction with cotton cords loaded with grease, and reported good results.
I'm using grease patties and FGMO with wintergreen.
I don't think there is only one right answer, it's whatever works for you.