Muschietti: “...I’m definitely more happy with this version than the four-hour version.” “You get excited, and you start improvising with actors, and suddenly you have a scene that has doubled the duration of the script.”
“Then you have to face the edit and say, ‘Okay, we need to remove one hour and a half of this movie. How’s it going to happen?’ At the end of six months, it’s fun. At the beginning, it’s just chaos, and whatever you start doing is wrong, seen in hindsight, because it’s trial and error. You try a lot of things.” Muschietti says: “There’s a lot of things that are in the movie that are on the edit room floor, but this is really the best version of the movie.” While he calls all of it “interesting, he adds: “Some are more interesting than others.”
Overall, I did like the movie but it's a far cry from the "One of the best Superhero movies" titles, Not to spoil too much but there's a lot of stuff missing when it comes to Keaton/Supergirl world, Supergirl is barely in the movie, and confirmation of the 4-hour cut makes a lot of sense, they needed at least 10-15 mins of character development before the finale battle because without proper build-up final action scenes just don't work and don't pack emotional punch and in case of Flash it was clearly rushed, it almost gave me Josstice League vibes. I would love to see this 4-hour cut but I doubt they will invest money into special effects for that unless most of the cut footage doesn't require VFX.