If ADCs are so good, why do we have other roles?
I hear a lot of the complaint "ADCs are necessary on every teamcomp, so they must be OP". Part of this is true, as nearly every semi-competitive teamcomp seen to date includes an ADC. However, this statement ignores the ramification that, if ADCs were truly more powerful than any other class in the game, we would see them begin to crowd out other champions in their traditional roles IE: Ezreal and Corki as the best midlaners and Quinn and Vayne running top. In general, AD Carries remain in bottom lane with their supports. Therefore, I simply believe the presence of an ADC on most if not all teams in League simply reflects the unique tower-taking utility they bring in order to win games. TLDR: AD Carries aren't stronger than other classes because they fail to eclipse other classes in their own roles, like ADCs appearing professionally in mid and top.
Thoughts? Responses?