For Ergo, I would honestly say no as there isn't too much in it being warrented for crafting. Maybe it could be as like you unlock the parts from getting different variations, but the problem is that its element is also random so it would be a bit iffy. That being said however, I would at least say yes in the sense that getting every single variation, much like exotic class items, is quite a pain and just being able to craft it would be helpful. As well, I find it funny quite a few people out there say crafting ruined the game, but fun fact, Ergo Sum was inspired by the Craftening. You know, the glitch with crafting that let us put traits of one weapon onto another. If we didn't have that, Ergo would most likely be one of the most bland weapons out there.