Is really Riot ok with me ruining the game for 4 people when autofill me supp?

I am a p4 player, a decent mid/jg. Basically always when I am autofilled supp i feed a lot - and make my team lose (I dont have time to learn other champs for this role, since i cant play more than 1 maybe 2 games per day - and all rank). I think autofill is shit and make your team lose game! what do you think?
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