What do you want to achieve?
Sometimes i need to change the same setting for a large group of widgets, allow a multiselect of the widgets in the Hierarchy and then change a setting for all of them in one go.
Mention some use cases
Example : calculator screen with multiple number buttons. The user would like to change the background colour for all of the buttons. By allowing a multiselect in the [Hierarchy] and then in the [inspector] showing only those settings that are available (the same type) for all the selected widgets it would allow the user to change the background colour with one single edit.