Can't agree, duels in 1.6 are judge by aim (first bullets), position, movement, reflex, then spray controll (and random patterns can change something here, but rather players know how to controll it). Is it that bad ? I think players like Neo and f0rest were good no because of luck but they had every element of the game on top top level and luck was reduced to the minimum. Also duels were more like 2-3 bullets, step left/right 2-3 bullets and pure aim were much more important.
Yes some flash were stupid I agree, but both teams could use that, both team known how to counter that (e.g by better position) ect...but it would be better without it for sure.
Russian walk and bhop were just part of the game, some people like it some not. For sure gameplay had more deep because of it.
People would chose GO version because more players of GO are young and most of them never touched 1.6 or even source. I think mix of GO and 1.6 would be the best.
Quickzooms, clean maps, better movement and harder spray controll (random or not) - and GO would be perfect imo.