I’ve seen this suggestion come up from time to time, and I’d like to add another vote for the feature. I frequently use the Upgrade Finder while raiding to evaluate each encounter’s loot table as we proceed through the instance. Because there is no way to tell the Upgrade Finder to assume sockets, items that would be an upgrade with a socket are often shown as downgrades without one. While this can be somewhat worked around via Add to my Bag, the 10 item limit and the monotony of manually adding a socket to every item makes it less than ideal. This problem extends to Best in Slot, which will choose currently-equipped socketed gear even though another item, once socketed, would be better.
With the tens of thousands of Cataloged Research you accumulate before reaching Rank 6 with the Archivists’ Codex and the slightly reduced need for socket-adding items due to Domination Gear being unsocketable, it is not terribly difficult to amass a sizeable stash of Alloy-Warping Facetors waiting to be used as new gear is acquired.