was the mana nerf on kog maw w needed?

He doesn't really have mana problems due to W when going AP since you go Tear. The mana problems are due to the ult.'s increased mana cost, longer time until mana reset and just the way it costs so much more after each shot.

Anyway, I'd much rather have an extra 1% AP scaling or 1% max HP than 40 less mana cost. I'd rather his abilities were costly but more game changing. I want Kog to be REALLY powerful during his short windows and he's just not strong enough to justify how short those windows are or his other weaknesses atm. He's not even a sustained damage source really because W was nerfed from 8 seconds to seconds. You basically deal high damage only half a fight.