At some point there could be indeed like a common document definition that could ease the process of sharings docs. However, that might be pandora box. Photoshop, illustrator and InDesign have their own utility and logic. Layout Design shouldn't be done in PS, image color correction not in InDesign and Catalogs not in Illustrator. Maybe it's for the greater good that there are walls ;)
At some point there could be indeed like a common document definition that could ease the process of sharings docs. However, that might be pandora box. Photoshop, illustrator and InDesign have their own utility and logic. Layout Design shouldn't be done in PS, image color correction not in InDesign and Catalogs not in Illustrator. Maybe it's for the greater good that there are walls ;)