Kassadin too weak vs AD?

I get he's supposed to be stronger vs mages, but I think he is at the point where AD champions (Hello Wannabe magnets Yasuo and Zed) counter him too hard. And honestly, Weak early/strong late is no longer an excuse, Take Yasuo for example, he works as a lane bully vs weak laners, yet he has a monsterous late game and he spikes really hard with just a shiv. I get that Kassadin's mobility was strong, but the game has changed, everyone is super mobile now, it's not an excuse to keep a champion in a nearly unplayable state.
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