If they insist on keeping challenges to sell challenge-swaps then not a single challenge should be hard to complete
For some reason 343i have tried to make the social environment more hyper-competitive in nature and that’s just not what the mode exists for, it’s to have fun at your own pace, people of varying skill play Halo.
The ideal system: Ditch the free to play model and ditch the battle pass. Just give us a normal full priced game that has a functioning progression/unlock system that feels rewarding.