I strongly dislike this idea as well. It won't make the game any more interesting, just a longer grind. I think that if the game needs to be made harder (which the Sewers level does), it should be with tougher opponents (ex: more hp).
It may work on PvP, but again, I strongly disagree with applying this to PvE. PvP games should have the option of setting this mode either on or off.
Edit:
Client performance should not be an issue. With each generation of phone getting substantially faster (new phones this year come with ARM Cortex A9 Processors), I highly doubt that this will be a serious problem in a year or so. In any event, I'd imagine that the majority of the demographic that plays this game is "tech-savvy".
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