GNOME Contacts still lacks the option to import/export contacts as VCard files because it uses a dead library written in Vala which nobody has the permission/guts to either rewrite or delete, and frankly I don't want to have more than one app to manage my contacts on a smartphone, especially if the third party one is not well integrated into the system.

It's a shame that these mobile developments still haven't really pushed the default apps out of their rut.