Why is Ezreal such a popular pick for marksman?

Like legit why do people keep picking him? They NEVER do any type of damage until full build and even then they get out traded easily. I legit don't understand why he's been so popular for so long. The only adc I can think of that does less than him is Sivir and even then a good sivir will still steam roll. Hell, even Kalista does more damage than him and she's easily the least played marksman in the game. What is the appeal to playing this guy? Strongly considering making him a permaban just to keep people on my team from picking him. He's always a dead champ in the game
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