That's another thing I'd argue is "weird" in macOS, the only widely used modern desktop operating system that does things this way, rather than vice-versa. Most

That's another thing I'd argue is "weird" in macOS, the only widely used modern desktop operating system that does things this way, rather than vice-versa. Most new converts from Windows or desktop Linux to macOS tend to accidentally leave apps open because of this, since the only indication they're open is a tiny dot in the dock, and most of the time, the only remaining UI once everything is gone is a menubar. For an otherwise document-oriented UI, the fact that an application can be open with no documents is a strange concept that requires some getting used to.