I agree. If they pull it off by 2024 it will be too too much of “see we said we could do it” and too too little of a robust mission it could be.
I think the original date was 2028. We could do lots of robotics exploration and exploration prep with them between 2024 and 2028, including preposition of material at the 2028 landing site ahead of time. Carrying and careing for humans takes a lot more weight and a lot more planning & preparation.