Hi. I was only almost 3 years old when the 70's ended. Also here in Europe at least in my times we get no landraces, only Maroccan soap bar that didn't get you high nor stoned, with no psychoactivity at all.
But some years ago I was lucky enough to grow a strain from Indonesia. The plants were muntats, highly mildew prone, completely hermie, no males, most seeds refused to sprout, and the buds once cleaned of seeds looked like grayish brown fluffy crap with no visible resin when dry. Exactly like these:
I have smoked modern suposseldly superpowerful improved indica/sativa hybrids full covered with resin drops and with more than 20% THC. But the Indonesian sativa high was incredibly stronger, happier, more enjoyable and trippy intergalactical-interdimensional-telepathical, many trillion light-years far better than the modern hybrid stuff with beautiful bag appeal.
So when I see people making fun of the old heirlooms appearance, I make fun of their ignorance and arrogance. Also I feel sad because the old sativa (now known as NLD) heirlooms are disappeared most of them.