No. Just because I am playing in a way that is not widely accepted as effective, it does not mean I am purposefully playing to lose or purposefully playing with a handicap.
there is a gap between what is believed to be effective, and what actually is effective. Sometimes that gap is pretty big, as shown by NightBlue (Assassin junglers, now everbody loves them) and Trick2G (Shove and shove, Udyr at the gates) and before them PhantomL0rd (Revive / Tp was the accepted "im gonna troll you" summoner setup on season 2?) and the guy who showcased camp before lane cheese with mid lane Vi, can't remember his name.
enforcing the meta is bad because of two reasons first it prevents people from having fun by having their own way of playing the game and secondly we freeze the state of the game by not allowing the people who discover all these things to make their discoveries.
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As for the Garen: you're right, either his overall game strategy (early gromp with smite, level 2 cheese with the gromp buff) or the rest of his game are holding him back.
thing is, YOU DON'T KNOW WHICH OF THEM. quite possible, this guy without his cheese is bronze 2. so maybe you should force him to cheese.