GAW,
The pass rate for the USMLE, which is required for all doctors practicing in the US is above 95%.
Your rule that a high pass rate is indicative of a low barrier field is hogwash. The facts completely disprove your “thesis”
The pass rate for Barbers and Cosmetologists is below 50%. That is not a high barrier field.
The pass rate for HHA’s, as low a barrier field as there is, is even lower than that in places.