I might be wrong, but it seems to me like most of the people who don't agree with defining JRPG and WRPG by reigon hold that stance because it makes the terms worthless. But the way I see it, that's completely fine. It's okay if 'JRPG' and 'WRPG' don't tell you much about how a game plays.
We dont need those terms, because we have other ones: Command RPG (for DQ-likes), Strategy RPG (for Tactics-likes and FE-likes), Action RPG (for full control), Roguelike, and so on. On top of that, there are modifiers like turn-based, real-time, grid-based, first-person, dungeon-crawler, etc., to further differentiate.
It's not like we have any shortage of good descriptors for these games, so there is really no need to hold onto reigonal classifications and insist that they can convey something about gameplay.
I see plenty of others in this thread follow a similar line of thought.