The whole point of her is Qing over walls into camps, Wing, Eing, and destroying them quickly then moving on. If you're playing her in a mana efficient way you're slowing your clear and missing out on being able to actually keep up with solo laners in exp because you farm so incredibly fast. Catalyst means you can always do another camp, always have enough mana to gank/clear, and stay healthy enough that invades don't bother you. The extra mana on RoA vs RG is a relatively big deal for just this reason. The reason she is so broken is because she can gank very well at level 3 at 3:15, clear as well as literally anyone, crushes team fights, and keeps up in gold and levels. Literally no other jungler can do that except maybe Rek'sai. I'm routinely 20 farm up on the other jungler despite ganking as much or more than he does. She's just a monster. You can clear a cannon wave in 3 seconds and get every minion. It makes no sense. You go top, win a fight, your laner backs, and you can shove it all the way from his tower to theirs and have it reset before he gets back. It just feels stupid.