Why doesn't league have a "safe to leave" like DOTA?

It is all good if someone AFKs during the first minutes, but what if someone leaves after 20 minutes? Give him 5 or even 10 minutes to reconnect and after that, make the game safe to leave. Some trolls might be salty and say "no" to every surrender. Why waste our time like that? Riot might think that we should all be happy and have an anime like "NEVEEEER GIVE UP JOHN CENAAAAA' attitude, but that is very unrealistic. I don't want to play a 40 minute game that is clearly going to be lost because our ADC is 2 kills ahead and thinks he can 1v5 everyne *cough cough VAYNE MAINS cough cough*. Thanks.
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