One For All hates AP Champions
One For All is one of my favorite game modes because I get to play champs that synergize with themselves. Yorick, Lulu, Yasuo, Heimerdinger . However there are two items that really make this gamemode unbearable: Adaptive Helm and Banner of Command. Riot permabans Teemo but they should really ban these items. Me and my friends want to play Heimerdinger and push the hell out of the lanes with our turrets. But if the other team builds 5 banner of commands and 5 adaptive helms there literally is nothing we can do. Build AD some people might say, AD Heimer is not something that is enjoyable at all, AD Cass is something that is not enjoyable; There's always going to be that one or two people who feel like Ah damn, I don't want to go AD cause we are all AP. Once there are 5 banner minions in one lane and 5 heimers trying to kill it; its impossible. And we do no damage against adaptive helm users which can abuse poison champions, dot damage, etc if everyone is the same champion. Adaptive Helm in general is amazing OP in One for all. IDK this is my opinion, I just feel like they should permaban Adaptive Helm and Banner Of Command, instead of champions like Teemo.
TLDR: One For All is only for AD Champions because of Adaptive Helm and Banner Of Command GG.