We have a large enterprise install. I wishing for a basic user feature right within AEM so that users could do this ad hoc on a page by page basis, depending on their design requirements. I think what you mention would take and active decree by god.

I believe your response is inaccurate. We are currently using the RESPONSIVE GRID LAYOUT.If I hide an element for MOBILE, it remains visible for TABLET and DESKTOP.If I hide and element for TABLET, it remains visible for TABLET and DESKTOP.BUT THE BIG PROBLEM is if I hide an element for DESKTOP, it becomes automatically hidden for ALL BREAKPOINTS, MOBILE, TABLET, and can not be made visible for any other breakpoint as long as it is hidden for DESKTOP.