I think with phyto-s, just like E and AAs, it goes back to "Your Mileage May Vary".
For the last year and a half I have been taking a lot less than recommended daily dosage of only Black Cohosh and nothing else. I am actually planning to start skipping days as the changes are starting to be more than I can comfortably hide. I really only wanted to stop the dysphoria.
People just assume that they need to take bucket loads but I don't think that is the case with everyone. We are all different and our bodies react differently.
For this reason I totally understand why Susan's is against telling people dosages.