I had a pair of Century skis (175) w/ Spademan bindings and Olin Mark IV (180) w/ Salomon 555E bindings that I used for ballet. They could crash moguls fine; but I still preferred my 190 Dynastar S730 for daily drivers (I just like longer boards than most folks my size,) even for those big ass moguls and hucking 360s (once around was all we did back then.) I was not in the game for new tech during the late 80's-2018. So, I can't comment on the rest.The Ballet? Maybe a dozen people bought ballet's as regular skis. Twin tios changed the skiing landscape along the lines of the way SUV's changed the automotive market. The Mark IV was important but not significantly more than a Yahoo 2 or Rossignol Freestyle or Dynastar Pulsar, it was just Olin's offering in that segment. It didn't change everything.