Honestly there is no good answer to this question. Some people do design very well and can balance detailed almost Tolkien like world building with the chaos gamers bring to the table, other can't.
The thing to remember is, your game is not your novel. You can reuse bits, you can write stories set in a world a lot like your game is set in but they are not the same discipline or the same place.
So yes, if you have fun at it and it doesn't take way your players fun, design away. On the other hand, its just as good to make something to just roll and go. Whatever works.
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