I thought of that but decided the advantages outweigh the risks. It is a guess because I didn't find much info on how big the risk is.
https://www.newlifeonahomestead.com/chicken-mites/ ... "If you live in an urban area and the flock is confined to a coop and run, common sense would tell you that the birds are better protected from mites than say, free range flocks. But, that does not seem to be the case."
Good dust baths and not overcrowding seem to be big factors in avoiding mite infestations according to many sources. And old fashioned whitewashing.