I feel like with Garen specifically Riot doesn't know what his specialty is
It's splitpushing and sieging that he is actually pretty decent at
I think this should have been the focus of the rework instead of just slapping on a random mechanic he'll barely ever get use out of on his R (and technically E)
Combine all the current changes that makes him weaker early to mid and buff the shit out of what he was always picked for: Killing Structures like a motherfucker
Passive cannot be interrupted by Structures
Q deals bonus damage to structures and the MS bonus is doubled when running at alive/dead Structures
W damage reduction against Structures is doubled and dealing damage to Structures reduces CD by .5 per Auto or tick of E (doubled for Q and Inhibs)
E deals full damage to Structures and increased damage to minions within a structure's attack range. These damages are increased if Garen is currently taking damage from the said structure he is attacking/guarding the minions.
R can be cast on Turrets for increased damage and treats them as Villainous if they kill a certain number of his Minions