I'm not spoiler tagging, but be warned that there are many spoilers for season 4 ahead.
Although I was intrigued by the concept and impressed with the visuals in all 4 seasons, ultimately I was disappointed. I may have been expecting too much detail in the world building, but there were important questions that were not addressed. In an earlier comment I mentioned one of them: who was doing all the necessary menial jobs such as cleaning the facilities? In the Process building, everything looked brand-new and perfectly clean (except for the basement where the prisoners were kept). Similarly, everyone in the Offshore seemed to be doing nothing but enjoying leisure time, except for those who had executive and professional responsibilities. Which leads to another important question:
How did the Offshore residents get the education or skills needed for the executive and professional responsibilities? It seemed clear that the Inland had no formal schooling, not even intact books (Natalia was excited to see complete books in the Offshore house), and no computer technology for online schooling. So where did the Offshore get, for example, doctors and engineers? Maybe the first generation (with the Founders) had the necessary education and skills because they came from the elite class Inland, but there was no indication that in subsequent generations those who passed the Process and came to the Offshore were given the education and training they would need to do these professional jobs. Maybe we were supposed to assume that happened, but at least in the case of Elisa she seemed to become a doctor on the Offshore with only her informal experience helping an old woman treat people Inland. If there was extensive training provided on the Offshore, it would have been nice if they gave us a glimpse of it or even referred to it.
This is why I was so disappointed in the ending. Not only was it hard to believe that all the factions who were ready to kill each other the night before would not attack during the night and would wake up the next morning all Kumbaya and walking happily together to the Process building, but it was even harder to believe that when they got there they would agree to a fair division of resources, especially considering that there were now fewer resources than ever and more people in one place than ever. There will be no more clean water or fresh food coming from the Offshore, so where will these essentials come from? (Not to mention clothing and other essentials that the pandemic has reminded us about, like toilet tissue.) And assuming they can obtain these essentials, who will decide how they are allocated? It's easy to say, as Joana did, that we will all decide together, but with hundreds or thousands of people that is not practical. Someone, or a small group of people, has to at least initially figure out the options and lead the meeting(s) to decide what to do. For example, they could pick a couple of people from each faction (the Offshore, the Cause, and Inland regular people against the Cause) to serve as the initial planners and leaders, with teams of people working with them. Once the essential decisions are made, they could set up a democratic society where everyone gets a vote and the leaders have set terms.
Another thing about the ending that disappointed me is that there were no consequences for Gloria, who switched loyalties so often that I had whiplash but should not have been so easily forgiven for burning down the Shell. There were also no consequences for Pedro and his fellow Process group members, who willingly (in Pedro's case, eagerly) committed murder in the final test and who would happily have killed Joana and more people during the Inland confrontation in order for Andre to win. When forming a new and better society, I don't think you can give a pass to those who are obvious dangers to the society and can't be trusted to change. The same is probably true for other Inland people such as the violent gangs that Joana and Marco encountered in previous seasons, who seemed to take pleasure in stealing and killing. There is a difference between those who reluctantly commit crimes out of necessity and those who do it because they enjoy the power or take pleasure in hurting people, and there should be consequences, such as prison or exile, for the latter. I put Gloria in the latter category because she did not need to destroy the Shell in order to survive--it's just that her desire to live in the Offshore outweighed her loyalty to the Shell group. She and her baby could have had a decent life in the Shell, but it would not have been as idyllic as the Offshore.