What's the point of Ezreal?

As a support main, I feel like getting Ezreal fed is pitching gold into a wishing well. He has no hard CC, is the weakest artillery mage, and doesn't have solid DPS; so what exactly is he contributing to a teamfight and therefore what's the point of getting him fed? MAYBE he blows up one person, or pokes out a mispositioning carry carry, but I'd rather have a more consistent win condition. I feel like all Ezreal is good for is laning.
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