I think you are referring to the epics that YNK originally sold that came already forged and boosted. They sold those once for a couple hours only and they were never sold again. Totally fukked up the EM and drove thousands of people out of the game. They have never done that since.
Not sure if you ever created an upgrade, I have - many times. What they sold you was parts. You still had to forge those the same way you forge your farmed parts. You used the same options and accessories that anyone else had to use. Which means upgrades were not carbon copies of every other upgrade weapon.