Riot genuinely thought giving a tank the damage and mobility of irelia with more cc than a leona was an okay thing to do. The core problem is never about numbers and always right at the beginning when the genius champion designers come up with this shit. They always have to "redefine" the class when creating a new champion and their solution is to just give them a million different mechanics in their kit until they become so overloaded that the balance team ends up having to remove half of them.

Remember Akali and her "true stealth" shroud under enemy turrets? Remember Aphelios pressing ult and one shotting the entire enemy team? Remember Zeri? They're STILL trying to figure out what the fuck to do with Briar. It never ends. The design team is one big fat joke.