I agree to a point, particularly your feelings on wild harvested... however, this is dicey at best, and one must know what they are doing - find the healthiest plants to harvest from - no way to tell this unless you wild harvest on your own.
Due to water availability, soil and air flow, one plant mere yards from another could be much "better", in terms of benefits.
Wild apes unless stressed, do not over harvest a food source, and choose only those plants that are the healthiest to eat from, leaving the weaker plants to recover from their stresses.
>>"The stresses of nature make for more medicinal plants, as well as healthier plants."<<
again, this is not true across the board... read above... however, that is one reason why the loss of biodiversity due to man made chemicals, GMO's, activities, etc. is so grievous.
The plants that do survive under the most stressful conditions, do develop a much hardier constitution... the same is true for humans, however, our creation of artificial environments, poor foods laden with chemicals, and pharmaceuticals has weakened us considerably, and our ability to battle illnesses over many generations now - to the point where we believe that we need artificial help (drugs, supplements, chemicals, zappers and the like, magnetics, etc.) just in order to survive.