Why the heck does the Japanese have a wider library of DLC to choose from and we're just left with the Advanced Sound Pack(which works well).

Namco Bandai (Bandai Namco?) is mad about licensing agreements so the license the Namco content is only available in Japan. Not like the Namco DLC content matters; it's just a license to use assets if you think about it.

Simply put, Namco doesn't see us worthy of their assets. Not that it's a big loss anyways.