To be fair you must see both endings (with and without Marie) to unlock all cut scenes, plus you physically can't get some trophies on the first round. So better luck on Second Round
I knew there were a couple things you had to do on the second playthrough. I think fighting Margaret is one, and maybe fusing the last Persona? But I'm at 93 hours on my initial playthrough, and I was hoping to get all of the Social Link stuff out of the way so I didn't have to worry about it in a second playthrough. I really don't want to spend 70+ hours on a second time through. Looks like I'll have to at least worry about Marie, again. :\ Is most of the stuff for the second playthrough late in the year, or can you take care of it early? I don't know a whole lot about that.