Should Last Whisper give less %Pen than Void Staff?

I honestly think it should. As a champ who utilizes AD items, you have basic attacks and skills you can use to increase your damage output. i.e. Talon; who is an assassin/burst character. You can build armor to less his spell damage but you'll still receive quite a hefty bit of damage from his Basic Attacks or Q (which resets his AA and is an empowered AA). Or any ADC in general.

Whereas AP Champions have a nerfed version of Lichbane to give them an basic attack-like damage, but it's hardly substantial compared to an AD user's AA which is consistent.

I feel like the cap for LW should be brought down while VS stays the same. There's no reason to give AD users the same max pen as AP users when AP users can only utilize their spells and not their basic attacks.

Further more- you could allow an innate system for anyone who strictly builds AP (deviates from your off-builds of course) a 20% ratio of their ability power on basic attacks. (This would be instead of nerfing LW, mind you. Not both at once. That'd be crazy.)

Just some thoughts from your every day bitter AD hater. <3