Drag & Drop File / Universal File Importer

The ability to import model files supported by the user's current add-ons through Opening the file via the Blender executable (Perhaps with a prompt to open in new scene or import), drag & drop into Blender, or a universal (All supported files) file-import menu option.

This appears to be relatively straightforward, I was told that the reason this isn't already a feature is (something along the lines of:) that there is currently no way for Blender to recognize which file extension an addon uses? I believe this would be pretty handy for user-friendliness as well as reduced workflow.