MrCrispy: hardlinks are not the same as junction points, by far! (they still require some knowledge for backup programs to handle them properly, but there's less risk of major fsckup).
IMHO hardlinks shouldn't be exposed by explorer at all, junction points and symlinks could have a column (requiring manual user add) showing the destination.
housetier: I find Chen's explanation good enough - abbreviated, it boils down to "users would fsckup, lots of people who think they know what hardlinks are, don't, and would also fsckup".