Why have we been balancing Ezreal as an adc all these years instead of as a caster?
Let's be honest here, Ezreal isn't an adc. Adc damage comes mainly from auto attacks, but Ezreal's power comes from his spells. I feel like if we started to balanced Ezreal as a mid laner he would be healthier overall. How do you do this? Well, all you really need to do is lower his base ad, then bot lane Ezreal will no longer be viable. Then you can start putting more power into his abilities and lower his mana costs and cooldowns. Stop trying to balance Ezreal for bot lane. Let him be the caster he was designed to be.