Well I can understand why you think that, but I think your viewpoint is rather limited. Judging by the response to this thread and the many others in this community I have seen a good interest in such a faction. And I don't think they need to be as exagirated as you think to be a good faction.
I'll just call this a difference of opinion, but I think you need to accept that just because you find these kind of playstyles boring, it doesn't mean that everyone else does.
Yeah you are right the interest here in a japanese faction is surprisingly big here.
But i think the interest in a japanese faction is only big because most People don t know much about the japanese army.In there Fantasy they believe that the IJA army had super cool tanks and vehicles and masses of modern infantry weapons.Well in reality they didn t have such cool things.
Most People who think it would be a cool idea to add the IJA have absolutly no knowledge about this army.
The People hear about Japan and think: "Japan? Oh cool lets add them".
If i ask These People:"What do you know about the japanese weapons and tanks?". The answer is: "Errrm nothing but who cares lets add them i mean its the IJA army".
It seems that most People havent any idea about the things they wish for.