That's the thing... from an architecture level, a modern Mac can already handle this. The fact that an app can have zero windows open (or minimized) but can be

That's the thing... from an architecture level, a modern Mac can already handle this. The fact that an app can have zero windows open (or minimized) but can be brought to foreground to interact with an app-level menubar attached to no window can be thought of as a bit of an anti-feature, depending one one's point of view.