It's actually quite amazing. To even acquire the quest needed to even get Izanagi's Burden (one of the most meta guns in the game at the moment), you need Forsaken, which costs $25 at the moment. Imagine buying or even re-buying (if you cross saved) Forsaken, and the quest to get the most meta gun in the game for the raid literally cannot be completed because Ada-1 won't give you the key mold to progress the quest.
To this day, after the weekly reset, the ONLY way to even progress with the quest is if you have done the quest when the annual pass content actually costed money (which is still probably one of the dumbest things Bungie has done with this game) or when they made said content free a couple weeks before Shadowkeep launch.
$25 for bugged content. Nice
I don't believe Bungie realizes how vital this quest is. It's a roadblock for folks wanting to do end game content. 80% of groups out there will not invite you if you do not have this particular weapon. This is not a situation of folks just wanting an exotic to fill out their collection this is literally making running other content very challenging.