Shen scales with how good his teammates are.
So when Riot buffs him people that know how to play supposedly break him, but its ok that he has no agency in the game with bad teammates even if by some wonder you manage to win lane.
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I would say he scales more with team communication.
Good players may not trust the shen to ult at the right time, thus they will not make plays shen could've made with ult.
This is all fixed with voice comms.