for sure. my opinion is this: never trust anyone's external evaluation of your fish disease safety protocol.
common pet store live rock is of equal value, smashed into rubble...because I would fallow prep it were it going into a marine fish tank I owned. a small section test of any substrate does not speak to the totality of that substrate, ab testing is selling people on a % likelihood
if I bought AB's rock rubble labeled as no disease, I'd then fallow prep it just to be sure.
same thing with Dr. Reef's qt prepped fish, best in the industry. if I bought fish from him, they'd then go into at minimum observational qt in my own home where I ensure all variables, sourcing from Dr. Reef and his initial preps is simply more prudent % likelihood success than buying from a fish store. until AB is able to sample the vast majority of an aquarium, vs .5%~ or less in my opinion, I think the hot words "dna" are doing the bulk of the sales.
I'm also skeptical because I have a large thread of ab's on hand where he says that caribsea live sand doesn't have any functional bacteria
yet in Taricha's currently running experiments forum thread he tests it as active, better at ammonia control out of the bag than some brands of cycling bac.
I don't keep marine fish, they're a hassle lol. but if I did I would never need a dna test of anything to reef with them for decades. it's a big huge massive fad in my opinion.