I think you're going to want LabVIEW R&D to respond, not an AE. And I expect the honest, perennial answer would be "because the current way works, and there's way too much other work to do right now."
One use case I found myself wishing I had this feature for: I have some common VIs for which I would like to be able to open the front panel; these are called in multiple applications. It would be super cool if I could let those subvis obtain a reference to the top level VI (using Call Chain) and insert a menu item.