I don't understand why lessons learned in the past are always forgotten the season after

From patch 6:9

Abyssal Scepter

Old Recipe: Blasting Wand + Negatron Cloak + Gold 780 = Gold 2350

• 70 AP
• 50 MR --20 MR aura debuff

"In a mage-vs-mage matchup, the winner often comes down to who finishes Abyssal Scepter first. Its 30 ability power bump on completion synergizes with its magic resist reduction aura to create a huge combat advantage upon completion. If that weren’t enough, the aura also makes it much easier to push minion waves into the enemy turret, denying opponents the gold necessary to finish their own Scepter. We’re repositioning Abyssal Scepter to play up its defensive aspects, while tuning its aura to be less oppressive in lane but more relevant in the late game."

Now let me translate that to current In a mage-vs-mage matchup, the winner always comes down to who finishes Banshee's Veil first. Its 70 ability power even before completion synergizes with its 20 magic resist bump and a spell shield to give a huge combat advantage upon completion. If that weren’t enough, the passive also makes it much easier to push minion waves into the enemy turret, denying opponents the gold necessary to finish their own Banshee's Veil because they will lose every trade to your spell shield and it will diminish the chance of a successful gank. And oh, you also get 10% cdr.

The new is way more oppressive than old Abyssal Scepter ever was and the reason it was reworked. Please stop reinventing the wheel all the time. Why do valuable lessons learned in the past get lost over time?