Despite Cozmo acknowledging on multiple separate occasions that it was a bug that they claimed to be working on, Dmg04 has declared that Xur will not be getting random rolls on exotic armor, and that it was the plan all along the whole time!

"Xur will not feature random rolls in Season of Dawn. Sorry for the news, but want to set expectations now.

Direct purchase exotic armor will continue to feature collection rolls. Think of this as an avenue for players who have not earned those exotics to check off the box and play around with the perk.

Xur will have the updated Exotic Engram, so once you've collected all weapons, you'll be getting a randomly rolled exotic armor piece each week. Further random roll acquisition will continue to be available through the Nightfall: Ordeal.

We'll continue to collect feedback over Xur and exotic random rolls as it comes in. I have no doubts we'll see players getting some killer rolls from the engram next week, but others continuing their search for the perfect roll."

Kind of a bummer. Xur's been an issue for Bungie the entirety of D2, despite them having him pretty well figured out back in D1, but those random rolls definitely helped encourage players to visit him every week. Ah well, at least They're Listening and passing the feedback on to the team.