To be fair, Persona 5 is my least favorite out of 3/4/5. Most fans of the series agree it's embarrassingly easy. Persona 3 (Portable is best, or FES if you're a masochist, but not Reloaded) offers a perfect challenge on the hardest difficulty, and Persona 4 was pretty well-tuned also. It wouldn't surprise me if P6 was closer to P4 or P3 than P5.