Stranger Things is concluding with a three-part final season split over two months, which the Duffer Brothers say allows the story to expand more than before. This planned division differs from season four, which was split unexpectedly due to the pandemic.
Ross Duffer explained that for season five, the creators knew in advance about the split, enabling Volume One to function as its own "mega-movie" with a complete climax.
"Volume One really exists as its own mega-movie. It has its own climax." — Ross Duffer
The fourth episode, which concludes Volume One, is described as the most technically demanding the team has ever produced. Ross also noted that the emotional difficulty peaked with the finale, where he found himself visibly moved multiple times.
"Episode four was the most challenging episode we've ever made, and that includes the finale – though on an emotional level, the finale was the hardest. I don't know how many days I found myself crying, and I'm not someone who cries very often outside of watching Pixar movies." — Ross Duffer
Overall, this strategic division offers fans a more expansive and emotionally powerful finale experience.
Summary: The Duffer Brothers thoughtfully planned Stranger Things season 5’s split to allow a broader scope and greater emotional impact, with Volume One standing alone as a climactic mega-movie.