P5 ran out of gas hard when the flashbacks ended - I didn't notice it much until I finished the game, but the entire setup of Joker being mischaracterized as a delinquent could have been removed entirely and nothing would need to be rewritten. Returning to the faceoff with Sae keeps you invested in his situation, but it ultimately it's all about the Phantom Thieves and not about Joker as a falsely accused normal guy.
It never drops Joker's situation entirely, but the game keeps his situation on the back burner until it reveals another character as a secret love child of the game's main villain who also happens to be Joker's accuser. It's hard to keep caring when the writers have checked out that completely.
I assume P6 will follow the calendar template so I hope it's more like P3 than 4 and 5 - it's been twenty years now, but I remember P3 being less episodic than P4 and 5's mind palace structure, with fewer distractions from its central story. The darker tailer has me cautiously optimistic, and even if it's Persona 3 episode 4 I'm kind of fine returning to nu-Persona every 10 years or so.