At this point, it's been argued to death, and rightfully so, that the main problem with the Star Wars sequel trilogy is that the writing is inconsistent between movies and there was no overarching plan for the story, which leads to a lot of plot threads getting introduced and then dropped by the next filmmaker. Obviously, each film in the series should be its own story and perhaps develop themes that the others didn't touch on, but the stories should still be somewhat overarching and fit in with each other. Otherwise, certain ideas get introduced in one movie and then never discussed again.
This is exactly what happened with Finn's stormtrooper storyline. In general, a lot of elements of Finn's story and character got dropped after The Force Awakens, which makes him feel like a somewhat two-dimensional character. The widely-circulated joke about him doing nothing in most of the sequel movies except for screaming Rey's name is a little too accurate, and it's really strange that these films had the opportunity to explore such a nuanced and interesting concept with the stormtroopers but dropped it almost immediately.
Star Wars: The Acolyte May Finally Solve This Ongoing Franchise Problem
Star Wars could really benefit from exploring new storylines and themes rather than just going back to the old ones and relying on nostalgia all the time. The movies always seem to go back to the same characters and the same ideas around legacy and family and good vs. evil that have been done multiple times before. It's not as though those characters or stories aren't interesting, but it feels like Star Wars keeps going in circles rather than trying to branch out with its themes and try something newer or bolder. The stormtrooper storyline
Read more on gamerant.com