The adc role shouldn't exist

After season 5 we often see more and more tanks dealing the most damage while having defensive status making facing against them a living nightmare.Some stats like the more armor you have the more damage you will do or the more hit points you have the more damage you do is simple just unacceptable.Dr.Mundo for example deals % hit points as damage while having hit points regeneration.Tanks shouldn't be able to deal damage but absorb it but instead of that we see tank metas appearing everywhere and Lord Dominik's Regards isn't enough to keep the adc role irrelevant since tanks can one shot everything in their path.Instead of taking marksmen in the bot lane we should take a tank because they deal more damage and they die way harder while carrying the teamfights.