What's the point of Rammus' taunt having an armor reduction effect?
Puncturing Taunt reduces armor by 5/10/15/20/25 for only 1.25/1.5/1.75/2/2.25 seconds (or shorter if the enemy resists/purges the taunt). That's... pretty lousy. Realistically, that won't give Rammus any amount of time to exploit that armor reduction.
Can't that taunt's secondary effect be something better? Something actually practical? 25 less armor on an enemy late-game is virtually nothing against a fighter, tank or juggernaut, especially when it usually doesn't even last 2 seconds due to Tenacity.