Probably because the games that developed aforementioned games are Japanese studios or creators... Topic really isn't mainly about the play style origin but the developer and overall style, I believe. JRPGs are even transitioning to action-RPG elements nowadays. "Witch And The Hundred Knight," "Demon's Souls," and "Dark Souls" to name a few... So does that mean we should call the genre poseurs?
If that's the case, I guess indie RPGs should also be in the same genre.