I've only played P5 and currently P5R.
The RPG part is amazing, the story, combat, dungeon crawling, interactions, etc, and all the other comments people had already made.
My only con for it would be the strictness of the schedule to do the story. Yeah, it's also an interesting part of the game which differs from other RPGs, but it's frustrating you might permanently lose something because you planned it a bit off or selected the wrong dialog option with a confidant so you don't have enough points which makes you have to spend an extra day with them to increase their rank.
Either you follow a guide or you accept the idea of missing some parts of the history.
And even then with a guide I think I might as well not experience everything since I won't go to visit some of the places to hang out with confidants, only the main ranks and that's it.
Also, you can't focus on finishing a confidant because I think all of them have some requirement, or they are not available that day, so you need to do other stuff.
For example, Yoshida is only available Sundays, Kawakami IIRC is also only the last days of the week, but not weekends and only during the evening.
But I plan to also play P3 and P4 since the stories are so good.
My recommendation for the next post would be series of Monster Hunter, Paper Mario, or Kingdom Rush.
I'm not saying to delete, I'm saying for the file system to save space by something similar to deduping.
If I understand correctly, deduping works by using the same data blocks for similar files, so there's no actual data loss.