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.
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.
