Importing CAD/PDF/Image is almost never the correct way of handling those file formats. The default method is almost always to link an external file.. Way too often unaware users select the import option anyways, which then results in file size increase and general model bloat.
Therefore, I believe that the Import-tools should be removed from the Insert-tab, and instead be moved to a contextual tab. The workflow should be similar to how Revit Links are linked / bound. First, you link a file. If you then need to import the file contents, you select the link instance in the model and then select import via a contextual tab.
