My understanding is the old content is fundamentally not compatible with the game currently. They did a major engine update around that time and chose to trim the fat, knowing that if they didn’t they’d have to update tons of assets hardly anyone cares about which would probably have taken another year minimum. I think them being more liberal with bringing stuff back would be nice but I don’t think bringing literally everything back is necessary. I think strikes, raids, and exotic missions are number 1 priority and after that, only bringing back locations/campaigns if they have a good reason to invest the time.