So... Blue Ezreal

Let's just be honest with ourselves, Iceborn Gauntlet ranged procs probably only still exist so pro players can make wacky plays and still use Ezreal in their games. But at lower tiers, it offers even less counterplay, specifically in solo queues where there isn't enough correct communication to bring him down if they even get the opportunity. But let's just focus in on the gameplay of Blue Ez. (Specifically Iceborn Gauntlet)

The stats given out by Iceborn give Ezreal so much utility and survivability. With the armor, he is able to out duel AD opponents or survive and escape, which is specifically key in this meta. The cooldown from Iceborn just makes his gameplay of lowering cooldowns even stronger. Lastly, the passive gives his Mystic Shot some decent damage and an incredibly annoying AOE slow on low cooldown. Couple this with the mana provided by Iceborn and Ezreal's mobility and you have a horrifyingly strong AD caster-type ADC.

Ezreal already has good items to build in this meta, from Mercurial, Maw, Triforce, Essence Reaver, BoRK and others. The amount of stats and gameplay buffs Ez gets from Iceborn are just ridiculous. If you also keep in mind that there is a hard focus on mobility in this meta, Iceborn shuts down anyone from touching him so long as he lands enough Mystic Shots.

Ezreal players, I get it. It's fun. No one can touch you or hurt you as badly and you get all the mana and cooldown you need. But let's be honest, Iceborn should be a melee only item. I think it's quite clear that some one at Riot wants Blue Ez to exist and I think it's mainly so pro players can use him.

I think that the other itemization choices on Ezreal are great and fair, but Iceborn gives him way too much power, utility, and survivability. I'm totally open to discussion on this issue, feel free to argue your points.