Excellent read: https://samsorensen.blot.im/in-praise-of-legwork
Agree with the thesis, but we must match the "legwork" to the campaign. Zero prep can be fine for a one-shot. The level of prep in "City State..." is unnecessary for anything other than a *long* campaign and comes with costs that will weigh down something shorter:
Costs: prep time to read & digest, GM holding and processing in-game, less flexibility to respond to player creativity. Worth it for the right game though!