Not only the chemistry knowledge, but the ability and equipment required to do proper testing of the formula on films - which is very, very far beyond the means of anyone on APUG past or present. Which is why in all honesty using any formula that has not come out of Kodak or Ilford at this point is mostly guesswork with results based on anectodal evidence at best. By the way that includes Crawley, current staining formulas, and anything else anyone has come up with.

This won't be a popular opinion of course.