You've never tried especially well grown cannabis of different varieties if you are under this impression.
Ahem, you might sound wiser if you'd lay off telling me (who you do not know and have never met) what kinds of weed I have smoked in my lifetime.

Several of my friends are growers who constantly exalt the traits and superiority of whatever connoisseur-grade marijuana they happen to be growing, so I can emphatically insist that I have smoked well-grown pot of "different varieties" and I can, just as emphatically, insist that I am under the impression that it's all a load of crap for people who love to think about various sorts of nothing.

Maybe other people notice these differences (which must be far to subtle for my crass mind to detect), but until I notice any sort of consistency in different-feeling highs and different-variety weed, I'm chalking it up to set+setting.