D&D4e created real opportunities because it didn’t fix problems the majority had, in fact it created new ones around compatibility, and so it created opportunity to continue D&D 3.5 that others could exploit. D&D 5e closed that opportunity down.

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So the question to ask is: what problem do I solve for folks who are in the majority, either because of mechanics, or access to a setting, that means they will pull my solution.

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It's no use moaning at the majority for not looking at other games, figure out what problem you solve for them.

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And then you need the marketing to tell them you exist and can solve their problem, but that is a different issue, and perhaps harder.

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