What's the appeal of these games? Watched the trailer but don't see it. Gameplay is that good? I can barely stomach a JRPG story these days especially if it's centered around teen or young adult relational drama.
Persona 5 Royal was my first and only Persona game. I've tried to go back to play 4 Golden, but I can't get into the dungeon flow as P5R is definitely the most refined of the series thus far - by a fair margin imo.
The hook with these games are the ways that the story and your social interactions directly affect the mechanics of the game like stats, Personas to use, Persona abilities, etc. Rather than having a story that is just tacked on like most JRPGs to give you something to fight (read: grind) for, Persona integrates the plot and plot interactions beautifully into the actual mechanics. It's much, much more than a tacked on morality system like in Mass Effect.
P5R is LONG but each section of the game is a self contained chapter. You can think of the game as having 5 seasons of anime to watch and each "season" takes about 20 hours to complete. So, you could play through a chapter, beat a big boss, then even sit the game down for a month or two before diving back in when you have the itch again. One of the catch phrases of P5 is "Take Your Time." The developers know the game is big, so don't rush through it.
The story, music, and RPG mechanics all meld into a wild adventure with some of the best English voice acting and writing I've experienced in a video game. I resisted for years but was blown away when I dived into P5R last summer. It's not really about "teen antics." P5R is about social injustice and an alternate reality created by the dark desires of the human race. It's a story about the human psyche that explores it in a way that I've never seen before. I was enthralled from beginning to end.
It's not a perfect game, but I'd easily give it a 90/100. I'd say it's definitely in my top 5 RPGs of all time now and a top 20 game overall. It's also one of the most personally significant games I've ever played - the impact the story had on me was not expected but entirely welcome.