Purgatory wasn’t purgatory though. It was their lives relived but without all the baggage that was in their first life. Ben didn’t learn all the “lessons” so didn’t get to move on. They could have done a better job explaining that concept, but I felt it was adequate for me.
Basically it was all about learning to have the right mindset. Hugo goes from disaster at every turn to “I’m the luckiest guy alive.” It was a beautiful concept, them having to find each other again and regain those previous life memories.
Someone behind the writing for the show knows the beyond-religion-afterlife. If you’re still reading and haven’t yet come across this information, the gist is souls come here to inhabit bodies, a lot of the time in soul groups, where the people you meet along the way, aren’t just by accident.
Lives are rather meticulously planned out ahead of time, and imo, they can and do go sideways, but tend to have a course correction, as even though your conscious experience here is limited to mostly experiencing just here, but your soul is still active There, working out those course corrections.
The main factor at play is the mind, which is but a tool, but we mostly use it constantly, and create egos, and at that point are subject to mental illnesses. Some things are body genetics though as well, and have the purpose for that soul to experience life in that manner.
And there’s little hints in various places. The Bible’s genesis story, eating from the tree of knowledge and being cast out of eden, that’s choosing to experience life as mind first.