Older DLC Campaigns should be replayable.
Before people go typing in the comments, I am not talking about making the Red War, Curse of Osiris, Warmind, or Forsaken replayable. ([i]As much as I might want to argue that sunseting the Forsaken campaign was a mistake, that's not what this post is about.[/i])
I am strictly talking about non-sunset dlc's like, Beyond Light and Shadowkeep. These campaigns should be updated to follow the Witchqueen/Lightfall format in which you can select individual story missions to replay at a higher or lower difficulty.
Currently Beyond Light cannot be replayed at all unless you delete a character and make a new one. Last I knew Shadowkeep could kinda be replayed but it's a once a week random story mission.