The story in the game was never its strong point for me. I don't get why people praise it. I say this because I follow the story, read every dialogue, watch every cutscene... but that's not really why I play. That's just a bonus.
The only exciting part about this game for me is completing the challenging content and becoming better with your job. After every fight, you make mistakes. I'm someone who keeps trying fights out until I make almost no mistakes. That's what's fun for me. And in that regard, this expansion hasn't been a let down. That first Extreme trial alone had me for hours trying to figure out a good way to find the safe spot during the stage turns.
The things you complain about are definitely improvements the game could work on, but they're not necessary in order for the core of the game to function.
Also, if you enjoy the game's story, that's great. But if you think it's amazing and worthy of praise even? Stop it. Get some help. lol