Why does everyone say Vayne is balanced?

She doesn't seem to have any weak point aside from her average range, or does she? And no, she is not easy to focus with her stealth & passive and a team to peel her. Also, her early game is not "bad", it's average and becomes strong the moment she has cutless I'm seriously not like bah OP nerf ( I just ban her in ranked or draft) or something like that but I feel like she doesn't have any weak points.
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