I disagree. An App Stores proposal is useful. Here's why:
There are many questions, such as approval process questions, that are entirely nontechnical from a programming standpoint, yet they have definitive answers. For example, a question about the cost of submitting to an App market, or a question about the approval process may have a canonical answer, yet will have no relation to the actual development aspects of the app. (It's true that the cost of joining a developer program is "too localized", but in reality, those things don't change often enough for that to apply.
I've seen questions about iAd activation being delayed. The general consensus is that contacting Apple is the appropriate course of action. That is a great question and answer pair that would work. For example:
Question: My app was approved last week and I'm still seeing test ads. My implementation is correct, what should I do?
Answer: Contact Apple. You can reach the developer relations line at (nnn) nnn-nnnn
App Stores is about bridging the gap between the development and business aspects of the App development process that don't fit on other StackExchange websites. Yes, I believe that this is a useful proposal.