might be on to sumthing ?
dunno how much of a different it do make, but if I try to remember back to my early grow years, we grew outdoors with Bag seed`s or seed`s we got from friends and other growers, as we did`t had any RIU or internet for that matter (late 80ish/early 90ish) or could buy good seed`s
I bet it was mostly/only Stavia strains and with out knowing I bet the THC was about 5-10% depending on conditions aso.
but I do know that the longer you grew the same strain in the same conditions the better it got, and we where allways looking for growers who had seed`s that had been grown for years in the same similar conditions ..
to day some old outdoor growers I know even mix/breed bought seeds with some of there old (+25 years) Strains that is used to be grown in Denmark (Scandinavia) in a cold climate to get there "own" strains ..