My Problems are not only about the Balance.Of course relic could add a japanese light tank and give them 500 damage or something.But the japanese Options in tanks and vehicles are generally extremely limited compared to the other armys.
The question is not only about the Balance its also about: "Is such an army fun to Play for the majority of Players?".And i have Problems to believe that its fun to Play an army with very limited Options.
And ok you could make it a bit unrealistic and give them some kind of japanese-magic-troops that can easily destroy enemy tanks but again: "Will most Players like such an idea and playstyle?".
Relic can not spend Money and add an army that almost nobody wants to Play.
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.