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by needle0 5035 days ago
The behavior in question is actually very new, as it became part of the guidelines only starting with 10.7 Lion. As Lion brought forth a whole lot of similar behavioral changes (which often conflict with those of either Windows/Linux or older versions of OS X), very few apps have adapted to the new rules so far.
1 comments

I think the new rules assume that apps are persisting any (invisible) state across quit/launch.