There are several things holding this movie back for me:
1. The year-long gap between the parent show and this release meant the character arcs lost momentum and my connection with it has dulled.
2. Despite being a movie, there is no noticeable difference in production quality or writing compared to the tv series, which felt like a lost opportunity.
3. Despite nominally being the main character, Saki's conflicts have never interested me as much as either Makoto or Ryuuji's, so focusing on her in the finale felt anticlimactic.
4. Expanding on point #3, while this movie does a good job exposing Saki's emotional trauma, the resolution seemed to prioritize her more dramatically satisfying romantic conflict over those deeper struggles we had just spent so long exploring.
That said, if you've seen the 12 episode parent show recently, are invested in Saki's arc, or enjoyed the manga ending, then by all means watch this and you'll probably enjoy it! If those things don't apply to you or you're just looking to get more time exploring the actually interesting themes of the show—gender identity and gender norms that both Makoto and Ryuuji struggle with—then you can probably safely skip this.