Basically picking Vayne is like this in this meta.
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If you pick a lane bully, it's gg for me. Because not only will you kill me several times and deny farm, but also you will take my tower. And since I cant push waves I'll be totally useless.
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BUT If I even get ahead slightly that lead will never be overscaled!
So snowballed, or snowball. No middle ground. Isn't this the epitome of what we are complaining? As a ADC if you get behind you will be stomped forever. But if you get ahead you will lead the game with superior numbers in both manpower and a stick of massive stats that spikes early due to Riot's misshapp in adc itemization.
Might as well go yolo and throw a dice and play Vayne rather than picking carefully right?