That's not even the best part. The person clearly intended as the main antagonist gets about 2 minutes of screentime. In the final episode.
Then the next kicker comes. Nagisa, one of the 4 original main characters, has been reduced to a secondary role alongside Rei, just introducing the teaser for the following episode.
You could even argue Rin suffers the same fate.
How they dropped the ball so hard is always going to be beyond me. This is Star Wars sequel trilogy levels of incompetence.