The solution to stone plate cho

Saying Cho'gath's ultimate is completely fucking broken is the same as saying Darius/Garen's ult is completely fucking broken. All of them are true damage executes and all of them need pre-requisite things you have to do before they are effective. Darius needs to get his passive stacks, Garen needs to be attacking The Villain and Cho'gath needs health. A large majority of his health comes from his Feast Stacks but if his ult's damage type is changed to magic damage, you just built Magic Resistance early on, Cho'gath would not be able to get those stacks and as such would not be able to execute properly.

He would also lose his synergy with Stoneplate and as such his ult would just be useless. I'm not saying Stoneplate + Cho is not broken, I'm just saying that taking away Cho's true damage is not a good solution. Until Riot does something about it, I would suggest either banning him or dodging whenever he is picked.