[{quoted}](name=Soul Dealer,realm=NA,application-id=3ErqAdtq,discussion-id=Z7ygcJI7,comment-id=000000000000,timestamp=2019-05-10T03:48:47.588+0000)
It because the way the reworked his w makes it synergize with lich bane very well. That makes ap malphite much better.
It's because the idea of stacking one defense type to counter a team is long since outdated. With the sheer amount of true damage, penetration, and %HP damage on top of the nerf to important armor items a little over a year ago, it's a dead theme. Not to mention the fact people are privy to the importance of damage composition when fighting tanks, now.
And the only real alternative to buffing tanks' damage is buffing their overall defense. But since 7.9 they've been making sure not to do that.