Subject / Background mask creation: warning dialog if Edit All Selected is off

What problem do you see this solving?

If I have many images selected in the thumbnail browser and the option "edit all selected" is disabled, then a click on subject or background mask should show me a warning message/question dialog (as is the case for exporting) to remind me that this option is disabled.

The problem is solves is that if I click on the mask creation then leave my desk and come back then I am sure the mask is created for all images, not just one.

16.3.1

When was the last time you were affected by this lack of functionality, or specific tool?

Yesterday.