My point was that easy cop-out answers, especially in GAF's NPD threads, have constantly been pointed out as extremely flawed and based on misinformation, lack of information, or willful ignorance. Just like "Wii doesn't sell 3rd party games" or similar disproved memes, the idea that JRPGs can't sell well on the 360 because the userbase is all about brown and grey bald space marines shooting things is pretty broad and when it takes no account of the retail appeal of the specific titles in their own merits, then yeah, I think there's a problem.
For whatever it's worth, Lost Odyssey as far as I'm concerned does prove that 360 owners will buy a JRPG, and I do think there needs to be some mention of the quality of the other games possibly affecting sales. How many people skipped on IU or Last remnant because they heard about glitches or flawed design? If we accept the notion that the 360 audience is "hardcore", then it would be fair to say the userbase is generally pretty informed on new game releases right? If every review mentions buggy design and gives the games scores 2-4 points lower than other AAA blockbusters releasing in the same period, or if every internet discussion mentions it, then how well does that bode for appeal of your game? Word of mouth can be a very powerful tool either for or against you.
I'm not denying that the usual western style genres don't have an inherently higher appeal and success rate on the 360, but broad dismissals never seem to be grounded in much reality, and that's why I was saying LO disproves "JRPGs don't sell on 360" as a generic auto-response to sales of certain games.