I really don't understand why Kassadin was buffed so much in 2 patches

>V8.13 Nether Blade Nether Blade NEW EFFECT: Now has a mana cost of 1. Active AP ratio increased to 80% AP from 70% AP. Force Pulse Force Pulse AP ratio increased to 80% AP from 70% AP. Riftwalk Riftwalk AP ratio increased to 40% AP from 30% AP.

and

>V8.17 Riftwalk Riftwalk Cooldown reduced to 5 / 3.5 / 2 seconds from 6 / 4 / 2.

His winrate was a decent place after the 8.13 patch. Now, just with Corruption + Catalyst he pushes me out of lane. And doing it in the patch before Worlds? Come on guys (Riot), buffing him like that was uncalled for especially since you didn't "compensate" nerf him.