I ran into a situation with a window that is movable by its background and a text field inside it. The text field draws neither border nor background, so to the user, it looks like an input field directly on the window’s background. Much like the Spotlight search box. Even when a window’s isMovableByWindowBackground is enabled, a NSTextField captures click and drag events, and it changes the pointer to a text insertion variant (NSCursor.iBeam). All that is weird when you don’t know there’s a text field at that point. And you cannot know how large the text field is if nothing is drawn there. When the background is gone, this feels pretty weird.

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