Quote Originally Posted by Necronopticous View Post
There is a certain expectation that developers are well aware that they must meet to keep their fan base strong when putting out an actual installment of a long-running and extremely popular series, rather than a spin-off. It's not just the name, it's what the name stands for and suggests for the content of the game itself. If the game was named Dragon Quest: Portable Ops (which it wouldn't be) there would be very few expectations that Square-Enix would have to actually worry about because fans aren't expecting a game of Dragon Quest X calibur, but rather a spin-off with familiar characters and possibly game mechanics (See: Dragon Quest Heroes: Rocket Slime.)

It is worth nothing that Portable Ops is actually part of the main Metal Gear Solid storyline, so even if what you were suggesting were more correct, it's still kind of wrong to boot.
Portable Op does actually have pretty different mechanics to the main games, but that wasn't my point. My point is that it is a major continuation of the story, that is considered less important due to being labled as "portable", while this is considered revolutionary because it uses the same numbering system as it's console counterparts.

The name of a game really doesn't mean that much. Final Fantasy XI's name didn't really "suggests for the content of the game" for example.