You are probably right for some games, but I disagree in the case of Power Grid.
Off the top of my head I can think of 6 specific articles I could write about Power Grid today. I'd say there are about 10 I could write total and at least 15-20 that could be written, not including anything about expansion maps.
If that particular resource exists for Power Grid today -- something you would consider an exhaustive collection of strategy, umm, stuff -- well I've looked for it and haven't found it. There is much more to Power Grid than "Count other people's money, memorize the power plants, try not to buy cities you can't power" and if something that covers that stuff is out there already then maybe we shouldn't do it here, but otherwise I don't see the harm in generating that resource.