I wouldn't call it a derail, not completely anyway. And I agree with your sentiment. I've always worked with small staff in the MUSHes I've run in the past, and the LARPs I've run. I find that it makes it easier for all staffers to run plot if they want, have a consistency to theme and ease of spreading information, and makes it easy to ensure that everyone is on the same page.
And you're so right; I haven't put down to paper everything that's in my head, and there are things that, when I put them down I'm like 'Ugh, why did I write that?' But I'm hoping to have a good layout.
ETA: There's also stuff that can be easily automated on my game that many games don't. XP spends, for example. So it cuts down a lot on the 'need a staffer dedicated to X, Y and Z'. Or I hope it will.