Fact is, there is no point in ever using directory hard links (junctions), is there ?
Considering the way they are handled by explorer, that is.
My point, using an example : one cannot hope to alleviate disk 'C' from its physical payload (moving appdata folders or program files to another disk 'E' and using hardlinks to repopulate 'C', thus keeping apps working). Windows explorer will still accumulate those links "sizes" to the -presumably- consumed space on 'C', throwing warnings at its user's face as soon as disk 'C' lacks free space, even if it relates to hardlinks "virtual" space consumption.
So, Windows 7's hard links ? Big disappointment.