I think Kassadin range reduction is a bad aproach for his undeniable nerf necessity

It's common knowledge that Kass is a pain in the ass yes. His main problem was always his mobility coupled with his high damage. So, it's only normal that the balance team fix one of those variables, perhaps both.

So they tackled his damage, BUT they made him a mobility monster in the process. Which I think was a really bad move. Kass could go in, deal good ( nerfed) damage, zhonyas, and go out without any kind of possible retaliation.

Because of this Kass was in my opinion never nerfed, but buffed.

I think there are to variables up to debate to nerf him. Damage and Mobility.

Damage is low as is now, except end game (via good ratios), which is good, because you feel good buying AP and setting aside some tankiness.

Mobility should be the tackled, but by increasing Riftwalk cooldoown, not decreasing its range. I think you feel much better riftwalking 700 range every 6 secs than 450 every 3 secs (the duration of the ult now).

The numbers are just explanatory, and of course should be tuned. But my point is, that traveling further is much more satisfactory than travelling more often. If good cooldown numbers are achieved, numbers that make Kassadin a dead Kassadin if he riftwalk incorrectly then we don't need to decrease his range, a change that is horrible (anti-fun perhaps?) for Kassadin players and won't make a difference for his enemies. Riftwalk could remain as a "think before act" tool instead of another spamming ability.