MattiThundrrr
Kona Fan
Can confirm at least one of those...Call is hearsay, but i heard it was because Canadian frame builders didn't like to use spirit levels and Canadian frame builders didn't like to use spirit levels and Canadian riders have big balls
But seriously, the West Coast sloping top tube style is attributed to Paul Brodie (at least by Paul). He started designing them for Rocky Mountain in 1985.
https://m.pinkbike.com/news/throwback-thursday-the-true-story-of-brodie-bikes.html