So, what can ADCs do against tanks now?

I have noticed that ADCs can't really deal with tanks anymore, not even with Last Whisper. I was playing Caitlyn last match, and there was this Shen against me. I bought LW just for him, but by my surprise, even with criticals, I did close to no damage against Shen. My critical strikes did 256 on Shen, and that's with ~200 AD and Infinity Edge. Seriously, isn't Last Whisper supposed to give us some damage against tanks? Cause right now I see no changes.
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