The interesting part about ADC is that it is the most high-elo skewed role, as "just surviving" and farming at high cs/min then consistently teamfighting is very difficult. The problem typically with the marksman role specifically is that if it feels "good" at low/middle elo, I personally expect pros (like perkz) to find it to be OP, as that is where their role is most important vs SoloQ. As an ADC main I always have to weigh the "I want agency!" vs "I know this role is much better than it feels".