
have you gotten good yeilds from the same rootbark EW?
I almost want to say he's screwed up his extraction somehow & is attempting to blame it on the bark if thats the case.
Even in the event there was outer bark, & this may be a bit different for acacias, but i've always powdered mhrb with the thin, rough, outer layer intact & never run into problems with gums/goop in my product & if outer bark serves the function he's explaining, it should have the same effect regardless of source.
Do you know for sure this guy has previous experience extracting & isn't just a noob trying to look as if he knows his stuff because he thinks he got given crap material due to a botched extraction?