something i dont think people really get is that when development of a game is say, 80% finished you don't have 80% of a game, you have 0% of a game and 80% of the disparate parts that would make up a game if they were actually 100% done and put together
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As someone who knows nothing about gamedev, I wasn't sure if this was typical "integration is everything", or much more specific "the last bit of polish/tuning is everything"
*obviously you can make it so said content can be experienced but that's additional work that has to be done first
Find the fun is our (and Id guess others) standin for saying that
Basically the 90-90 rule.