While I think all of this is very silly anyway, a more practical point is: there are millions of characters in this game, and max gear/omnicrafting/specialist/whatever you feel necessary to distinguish people who have the "right" to apply such signatures is easy to gain. There's no way they can implement any kind of freeform "signature" to this, and even if they were able to give you a limited number of alternative animations or other methods of distinguishing the items, you'd still have hundreds if not thousands of players on each server with the same one (as with FC logos). The only thing that is unique is the playername, and I really wouldn't want to see "Moist Harmonica" (you laugh, but I've seen them) or whatever the crafter's name is flashing across my character any time I consumed an item, or stitched onto my gear.

It's not like SE cares overmuch of consumable animations anyway, apparently my character drinks tea out of a flask and all foodstuffs look like muffins.