Low elo theory crafting.
Assuming adcs build one defensive item late game,
would work better with gargoyle plate instead of ga. She's a duelist adc which focuses on melting tanks. You can only do so much damage to Vayne before your rotation goes off cooldown. Even if her damage is reduced by the active effect, if she goes with the on-hit build path you're looking at a 3k+ hp adc chunking 33% of anyone's hp in a second or less.

+ gargoyle plate.
Can anyone confirm if this is viable or not?