[dkersten]

Fun isn't a well defined, well understood thing. There's no quick and easy way to know if something will make the game more fun or not, you often have to guess and just try it out in a prototype. Fun is also subjective, so fun for who?

In the example given, adding something to multiplayer isn't more fun for people who don't play multiplayer, but it may well be for those that do and since they're the focus, the feature gets added. So "prioritize multiplayer" is a useful razor because you can act on it: does it add to multiplayer? yes, it gets kept, no it gets cut. Its actionable. Is it fun? Who knows, you gotta test it out first.