Qt Designer: "visible" property flag in object tree

Request to add a "visible" menu item in object tree to hide selected widgets in editor.
Why this kind of request always rejected?

Widgets in Qt have a "visible" property. This can be used to hide elements. In Qt Designer, however, it is not possible to set this property, let alone to manually mark/recognize the entries in the ui-file that have been edited with the property "visible".