Plus they have to frontline, engage supports have to be front and center, and often are leaving their ADCs side to help catch a pick. Enchanters get to stand back and use all of their cc to disengage and peel for their team. Legit a lulu just dancing around the backline and throwing spells on cd is more impactful than the leona who has to dive 1v5 into their team and stun someone and pray their team backs them up, they don't have easy escape mechanics, so they are fucked if nobody comes with them or it's a bad engage. Enchanters don't have to worry about any of that and can just polymorph whoever dives the ADC and throw shields and slows to keep their team alive.