Certainly T makes broken champions. Not overpowered champions.

Certainly Ts champions go as follows. Not a single champion on this list is truely overpowered. (aside from zoe but give her the release leeway) All of them have massive weaknesses that means they are either gods from getting ahead or garbage from feeding. Has to be in range and must get ahead or else he will be too squishy to stay in a fight. Needs attackspeed to keep kiting or she will simply get ignored. long ranged poke but needs to nuke each q and cant be aginst a team that can engage. needs ap items to nuke an entire team or will become a cc droid. You might as well have just picked braum instead if this happens. Has alot of utility and thats it. He deals some damage but most other supports outdamage him. Needs to get team fed. If you shut him down and end the game he will never be strong enough. Even if he runs around like a moron itll just be annoying.

Now heres why they are broken. Every single one of these champions if they are fed will be able to end the game on their own. Yes even a fed thresh can roam across the map and end the game. This means they can never be balanced or they will become overbearing. They always have to be under the powercurve. If they are allowed to have any power that would allow them to get ahead they will be op.

For reference; a champion that is as far from broken as possible can still hard carry if fed but can have a great early game and be on the power curve. He also can easily get behind and still be relevent with his medium range tank stats and ult.

So in other words even if the game was absolutely balanced with every champion being exactly where they were supposed to be getting exactly a 50% winrate, these champions would still be either overpowered or underpowered. Unless of course you bring back ap yasuo, then he will be completely balanced.