As /u/ffxivthrowaway03 has stated already, the 'J' in JRPG is a cultural factor. If you were to argue otherwise, you're inviting an infinitely ambiguous criteria to be made on everyone's personal behalf on how they define "Japanese." Which is nearly insulting to individuals from that country, I think. Perhaps we like JRPGs because Japanese culture is something we are inherently curious about. And yes, maybe each of us are fond of certain trends in Japanese game design. But there is no one design and it's gotten incresingly tiresome hearing people dismiss Japanese made RPGs as not being truly Japanese.

To the OP: It's hardly just an obsession with turnbased, and this matter is much more worrisome than just a want for an old battle system trend. People have preconceptions about what is true 'Japanese' entertainment and what is not. Character designs, battle systems, narrative style, etc... are all compared against these preconceptions and a conclusion is made based on how well they align. Even this subreddit's sidebar has its own thought up view of how a JRPG should operate compared to its Western counterparts. This fails to acknowledge that variety in JRPGs is essentially impossible to nail down or define to any design rulebook. You can't funnel a culture or the products it produces to a set of rules.

The dismissal of the Souls and Bloodborne series is a great example of people (outside Japan, mind you) discrediting the native origin of a Japanese development team on the pretext of their game not being "Japanese" enough. Even though Bloodborne is clearly an RPG by every definition, it misses the staples of stereotypical Japanese entertainment and so it is booted from the category of being Japanese. If it had a Tales art style and a bathhouse scene, perhaps JRPG connoisseurs would allow From Software back in the club.

I'm at least glad to see that there on those on this sub that see Souls games as JRPGs, and don't shun them for being a little less "traditional" -- whatever that means.