Yes, quitters suck. I have had several games where I get stuck in a loop of dying endlessly and back out to save my sanity.
But penalties for the casual mode won't work well, connections are getting worse and kicking people out, rewards kind of suck, and lobby balancing is some of the worst we have seen as a community. There are inherent problems with the game that drive people to quit early, and this will just push people to not play pvp.
Edit: So to add to the frustration, I just got error coded during the start of a control game, then got a suspension for it (My Internet connection is fine). This is the issue of what happens when they decide to add stupid penalties, if you people can't see this as an issue, you are part of the problem.
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If you want the option to quit, go play Rumble. You won't be ruining anyone else's game there