The point isn't to play it over and over again, each week you get a new set of deep dives, once you complete em, you are done with them for the week. They are like that so you can share strategies with other people on how best to beat it.
This. Plus a chance for friends / speed runners to compete. The ability to replay and prepare is what also let's us crank the difficulty a bit. We knew however that this would not be for everyone, which is why we also made the weekly core hunt.