That sounds a bit exaggerated and non-sensical to me. The increase of 3 m range hardly is a game changer. Warlocks get Flight in contrast and are the only caster class who could really use that for a tactical hit and run/fly play.
3m/10 feet for your entire party and all summons at no cost to you in spell slots. It's huge.
In adidition, no class in this game needs genies to get along. With multiclassing you can get the Warlock possibly easier to big damage. As single class I would decide from fashion which to take.
What?
