I have seen this somewhere I don't remember now, but in short the (whatever it was) said that many RPG fans (as is my case) go to the for the story but these days you don't need to go to an RPG specifically when you want to get invested in a world. Sure there are other things in RPG, just as they still appeal to us to this day, but one big point is lost, I mean, not lost but it can be achieved in other genres just as well.
No no Kuni is a game I'm liking but I'm sure I would have liked it more some time ago. I still have fun every time I play it but it just doesn't pull me in like some others do.
I liked the editorial a lot myself, I'm just in a somewhat random spot where I can't be sure if an RPG will grab me or not. I don't know if the thing are the mechanics or the characters or whatever. Some games like P4Golden, Etrian Odyssey 4, Totori and Meruru, Dark Souls and FFXIII-2 I can play for hours and not even remember when I started while others like Ni no Knui I do have a good time but I don't have an urge to play all the time.
On the other hand, at least the Ni no Kuni type, at least I feel I can play while doing something else, If I need to go out in a certain time for some reason, I can grind a bit for money or familiars and it is still fun to do so.
In the end, we longtime fans of JRPGs should just lower ours expectations a bit, at least that's what I'm doing as there's no magic recipe for a good JRPG.