HQ items cannot be restored through item restoration if not discarded

Recently I accidentally desynth an expensive crafted item with expensive melds, knowing that there is an item restoration policy, I filed a ticked and talked to a GM who said "HQ items are not restorable as they contain unique information."
I asked if it were any different if I had discarded it accidentally, and got the response "If you have accidentally discarded the item we will verify discard though our logs and if evidence is found your item will be reviewed for restoration."
Apparently you can only get your HQ item restored if it was accidentally discarded.
If any dev, or community rep would like to share why this is that would be great

I didn't find the right solution from the Internet.

References:
http://forum.square-enix.com/ffxiv/threa...f-not-discarded

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