Those photos bring back some real memories for me. Now most know where and why Knolly bikes came from.
Riding the trails that are pictured on the bikes you see is a real feat (I know) since the suspension was nice but nothing like what we have now. I remember when Marzocchi came out with the Z1 (which was 4" travel) and that was considered a DH fork. It was a big deal and I remember well getting my first Z1 which was actually the Mr T. (a triple crown version that was 5"). Don't underestimate the skill, body english and commitment needed for such riding. You had to commit to every stunt 100% since the bike being a bit more "simple" was less forgiving.
I look at my bike today and clearly it has progressed from what I had to what I have and this riding style definitely groomed it.
I do miss those days, though, when going up to do Pink Starfish was a big deal and there was a group at the trailhead. Doing the rockface 3/4 of the way down on those bikes on V brakes was a real experience.