Why are these plants not prescribed /tried by specialists [neurologists]

[Bacopa,Withania, [Rosemary]],Ginseng etc]

The only one sometimes suggested is Ginkgo , the one that has oftern been shown not to worrk!! Is this all to protect the drug-companies which are so connected with doctors?

https://pubmed.ncbi.nlm.nih.gov/35692129/