Why does Demacia, Noxus, Ionia and Shurima still use Melee weapons?

Piltover, Zaun and Bilgewater have started using guns. Shouldn't they start upgrading their weapons? I mean, Jinx has a freaking Gattling gun and Rocket Launcher. How the crap is Jarvan, Garen or any other Demacian gonna fight that?!
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