Something that promotes FOMO is the Capstone challenges being unavailable the next week.
The Challenge and Reward should be permanent after unlocking said challenge.
If you miss the challenge 1 week, you shouldn’t be punished for it. Nor should you be able to just buy the reward straight up, it ruins the point of Capstone as a whole.
How do 343 fix this, be able to buy the challenges. They could sell them for a 1,000 or 1,500 credits each. They could also sell an extra weekly slot, to speed up getting the capstone, every week for like 200 or 500 credits each time.