Why exactly do mana-less champs have overloaded kits, while mana champs do not?

Most of the mana-less champs have abilities that all do damage or scale very well ( I am looking at you riven ) While some mana champs have 1 or 2 abilities that are extremely situational. Mana-less champs even have low CDs which let them spam much more than what a mana champ would because of their resource. I would have preferred if non mana gated champions had some kind of drawbacks to them which allowed mana gated champs to have a better chance against them, now since mana potion has been removed early game poke highly favors energy or no mana champs.
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