Lethality made Armguard go from "below thrash tier" to "absolutely golden"
Just sayin' in case somebody didn't notice*****.
As Lethality doesn't get to penetrate much armor until later levels, armor is actually a worthwhile early game stat on squishies now, and Armguard happens to be one of very few, if not the only, armor item that a squishy champion can reasonably purchase early in the game.
***** and I guess many people didn't because, I haven't seen any posts about that from "assassins got hurt so badly" jerking circle members :>