Should Nashors Tooth get a 5% on-hit buff in light of the Fervor of battle nerfs?

I feel like on-hit builds got hit pretty hard because of the changes to the keystone Fervor of battle. In regards to this, some on-hit items got small buffs.

now does 8% current health on hit. got a 25% attack speed increase.

Why wasn't tooth added to this list. It is an on-hit item. Besides that, ap on-hit has been slowly declining.

Remember the mastery Arcane blade? It gave champs 5% ap on hit. This along with made it possible to get 20% ap on hit. That was removed in season 6.

That 5% ap on-hit was kinda introduced back on the previous version of rageblade. But now rageblade no longer grant 5-7% ap on-hit.

So can get that missing 5% ap on-hit?

I don't mind paying more for the item. I just really want back my 20% ap on-hit. It really help with build diversity such as

AP
AP AP AP rework looks it as potential for ap on hit. ap rework

Again, it would really help with build diversity...