People have a hard for nostalgia when it comes to P3 and P4, that's all it really is. The dungeons are 10x better in P5 than they were in previous Persona games. Good enemy variety (Kaneko demons being back), puzzles, stealth, different themes each time with intricately designed levels, shortcuts, more combat choices (guns are back, negotiations are back, more spells including some old school ones from P1 returning), QoL improvements with regards to party members swap outs, faster battles, no party members telling you what the weakness is right away, more challenging battles etc. Just far, far better overall. Only negative is the calling card crap which prolongs the inevitable boss battle.