[quote name='corrosivefrost']Depends on how current the game is, I'd wager.
At this point 3S is pretty much in the books -- they didn't redraw the graphics, they just added GGPO and some extra bells and whistles so far... which is why the DLC menu that "can't be talked about" is so strange.[/QUOTE]
This. Fans want 3S in its original form. Don't mess with the balance or add/change shit, unless you're giving me the option to enable/disable it. HDR still had original mode, for example.
Plus it's a big pain in the ass to go back and add a 2D character in a game that's been finished for over a decade.
BlazBlue is still fresh, still in development, they just updated the arcade version, after all. So it's way easier to jump in, add a character, and balance it all out.