Comment 4 for bug 1502706

Having graphical/GTK applications started under sudo is a security issue, the fact that you know some example of program doing so doesn't make it a good idea. The right way to give access to user-restricted action would be through polkit integration (which is what update-manager, software-center, control-center gnome-disks, etc are doing) and not by having the UI being under privileges as well.

In any case feel free to report that bug to GNOME since they are the ones writting nautilus, Ubuntu is not likely going to look at issues from non recommended usecases