My whole passion project is more or less a "rough draft", so I don't think it's that farfetched!
I think it'd be weird not to
Things are going to change throughout development pretty consistently, so I don't think that a rough draft is weird by any means. If anything it helps you make those changes sooner which helps progress move along quicker later on.
Some people use game design documents as such. It contains everything they plain to use for the game; rough story outline, character info, etc...
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