Earlier quoted context omitted.
Is it naïve to think that clinical trials have show that modern medicine is more effective? And the active molecules in those plants have been identified and can probably in many cases be synthesized more easily than extracted from the plants.
While I think the assessment that modern medicine is more effective, and often stands on the shoulders of these types of historically used plants, not everyone has safe access to modern medicine (either because "modern" medical treatments aren't available where they're located, lack of finances to pay for it in egregiously overpriced areas, or general mistreatment by the medical community). Using alternatives, while…
If lack of finances is an issue, growing your own herb garden certainly isn't the solution. These plants aren't going to replace a $500 shot of insulin. At best you could maybe replace the occasional aspirin, dramamine, or buscopan, all of which are available over the counter at price points much lower than what it would cost to even buy a bag of quality seeds, never mind soil, fertilizer, and the garden to plant it all in. (Or the time and labor to plant and tend it).