And to me that's the greatest flaw of this season so far. So much hinges on what Simone, Brent, and John do, but we never really see them doing. That's why I've pointed out that while we are TOLD (over and over!) about how uniquely horrible Brent is, what we've actually seen IMHO is not actually any worse than Eleanor and Jason.
Personally, I think all of the stuff with the Bad Place interfering should have been cut to let us actually see the Simone, Brent, John, Chidi foursome interact with each other and Team Cockroach and return to the ethical questions of what do we owe each other. I'm not sure why Simone's disbelief couldn't have been the main driver of conflict and comedy.
But even here... Simone claimed that they metaphorically ran the experiment of helping Brent over and over only to have him remain horrid. However, based on what we saw, they absolutely did not. Simone was always mean to Brent in the scenes we saw--arguably justified some of the time, but still mean. It was very different than the interaction between Tahani and John where some genuine vulnerability on Tahani's part made a huge change in the relationship. We also saw Michael use a polite but firm approach to create some small-but-seemingly-genuine change in Brent at the end of Chip Driver Mystery.
Eergh, the more I'm thinking about this, the more horrid I think Simone's behavior was and the less I believe that the character we met in Australia would actually be that horrid. I think the show could have developed Simone to that point by showing how her disbelief kept her from viewing the other residents as people (and she would have been correct that the overwhelming majority were not). But we needed to see that.