Today I discovered quite by accident that several applications are now stored in
/System/Applications/. I realized this when I was trying to find the bundle ID of a built-in application, and even though it appeared in the Applications folder it was missing entirely from
/Applications! I suspect this change might have come when I recently upgraded to macOS Catalina, but perhaps it was even earlier than that.
Which version of macOS introduced the
/System/Applications directory? And where is this documented?