We are not even supposed to try to come back aren't we?

So this happened the second time in about a week now, my internet connection crashed for 1-2 minutes, even though everything else was already working again league wasn't able to reconnect for minutes, both times I rejoined the game, both times my team won (to be fair, I didn't play much of a role the second time, first time finished 18/1/8 on Jhin, so I guess I did my part in that one), and still every time I still lost as much LP as if the game was a loss. So a pretty basic question: Why even bother to try to get back as quickly as possible and still win the match when you're getting punished with a loss anyways?
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