[HYPOTHESIS] What if LW and VS had to be activated to give you the penetration?
Last Whisper and Void Staff are items that kinda mess a lot with balance, if one thinks about it. They are incredibly cheap, and have such good cost efficiency for what they do that they're practically imbalanced. They also end up being "no-brainer" items, in that you don't even think about "should I get a Void Staff?", and instead think "When do I get Void Staff this round?".
Morello said a while ago that Riot would look at both penetration items, but nothing came of it. They're still the way they've been for years.
Thus I had a thought: What if you had to activate those items to get a temporary ArPen/MPen steroid instead of the effect being passive?
Note that I do not expect Riot would do this, as it'd be "too much noise" in terms of things to keep track of during fights. But humor me and think about it for a moment. What if you had to activate LW or VS to get that penetration power?
the holy-trinity of ADCs as they'd muscle through that disadvantage without much of a power loss compared to their allies.
though - as the basic glass-mage build is 
where the glass-assassin build is more reliant on 
or 
.
