ADCs, their Items and range crit are the biggest reason we are only seeing Enchanter Supports

ADCs being as overpowered as they are limit the choise for supports alot.

First, not buffing the ADC means you dont support the most broken champ in the game. You try to make weaker champions stronger, but even with your support, they wont be nearly as powerfull as the ADC. So Supports that make the ADC stronger by 50% are better for the team than a support that makes the Bruiser 100% stronger. Which means that even if the Support by himself is actually WEAKER than other Supports, as long as he can proc Ardents on the ADC, hes wortth more to the team.

Next thing is: Tank, Engage or Poke supports get killed by the ADC.

Supports dont get the gold other roles get. Trying to tank with a support means the ADC who can easy kill real tanks will just melt you. If you are a poke support, one Auto Crit from the ADC will deal more damage to you than your poke does to them, and they can just Lifesteal it up. Same problem with engagers. The second you go into the range of the enemy ADC, you are already at half HP because you are not really tanky and you just ate a 500+ dmg autohit on a champion that maybe has 2000 HP.

You want more diversion in Supports? NERF THE DAMN ADCs ALREADY! ESPECIALLY RANGED CRIT!