As another example for how much differentiation there is out there to be had, consider two 30%+THC strains, each with no detectable level of CBD. One affects you like coffee, and the other affects you like valium. To what do you attribute this difference? If you say you don't believe in such a difference, then I will know you are just being an armchair quarterback and have never actually tried these things for yourself. If you say Indica/Sativa, you will be wrong. If you say individual metabolism, you will be wrong.
Ever tried CBN isolate? How about CBG? Ever experimented with terpene combinations? Tried combining hemp with MJ? Ever smoked or eaten a 1:1? There are plenty of things to try in order to convince yourself that you are wrong.
EVERYONE has an opinion, but few hubbers have really jumped in with both feet to make sure they know exactly what they are talking about. Cannabis is one realm where it is better to walk the walk before talking the talk. This is exactly why growers and patients have been teaching doctors about cannabis and cannabinoids for the last decade, and not the other way around.