I’m not sure telling an untold story is repackaging. It’s exploring an existing characters story further

Rogue One told the ending story of Cassian Andor (among other things).

Then it was decided to go back and explain that characters backstory. Everyone, understandably, loved that.

Hell the entire prequel trilogy is going back and telling us the origins of Darth Vader. The origins of Palpatine.

I’m not against new villains, but we have other shows for that. Skeleton Crew introduced a new villain.

Acolyte did tie in with an old, as of yet unseen, villain, but also introduced a bunch of new ones.