This is a sweet video. I am very thankfull for modern day discs. I don't get how I could have survived with the discs in that video.
Same way we did. You didn't know any different so you learned to adapt to the current equipment.
I played for 2 years in the mid 70s with a World Class Frisbee. 140 and 165 gram. The courses were designed for the Frisbee so it seemed right to me.