Why do people act like Vayne's early game is completely terrible

all you need is the correct support and there is no champ who isnt good early, making late game scalers all the better

Because one example of something worse than you, does not automatically mean that your problem doesn't exist.

That's like saying people don't get sick unless they have cancer, because cancer is worse than a cold.

I'm not actually hungry right now even though my stomach is rumbling, because kids are starving in Japan.

You see why it doesn't make sense?