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I'll concur with this problem. All Riot has to do is look at people's match history and see where leavebuster or reports agree. It's really bad when it's a normal game, but it just makes people say "oh well I don't care" in a series division (or especially the deciding game) when ANY player goes afk. It's a 5v5 for a reason.
Yes there are times when 4v5 can win, but you have to count that the opposing team doesn't know, which usually isn't the case, and prevent them from just 5-man laning.