Comment 62 for bug 28835

As I said above, Nautilus developers consider they have fixed this problem using "Eject" all over the place, except for sub-volumes of a disk, which still use "Unmount". But this case is relatively rare, for standard uses (USB key, audio player, external HD, network mount...) "Eject" will be used - and unmount will only be a fine-grained option in addition, for technical users.

So no need to reinvent the whole debate: we must take into account their choice since I don't expect them to reverse all these changes without very strong arguments.