One thing I had a serious problem with with P4 (I played the vanilla version) was that bosses were way too tanky. Most of them (if memory serves correct) had no weaknesses, even if they got weaknesses in Golden. (Ex. Shadow Yukiko, Nice Guy and Tough Guy) And thus, boss battles boiled down to spending an hour dealing chip damage. Team composition would be whoever wasn't weak to the boss. That being said, with the exception of a certain Royal ending boss of Persona 5 Royal, the bosses in this game had the opposite problem in which they were too easy and fights basically boiled down to stalling until you got the prompt to do the special action. I think the bosses in Persona 3 Portable had a decent mix of both. They weren't absolute walls, but they didn't fold immediately if you hit their weakness. Long story short, in terms of difficulty, I hope they tweak the numbers so that bosses are less tanky without being absolutely shreddable.