You're only looking at one side. Dynamic difficulty also allows players to progress by lowering the health of a boss they've failed to beat for over two hours.
Casual players giving up was a problem that no amount of shaming managed to fix ("haha skill issue, sucks to suck").
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How is it a problem? Giving up is absolutely fine. Different games are made for different types of players. Who cares what the others think (or you think they think). By trying to cater to everyone you satisfy nobody.
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Just make it a concrete option then. What is the point of being sneaky about it?
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