I guess for the same reason that Baldur's Gate 2 Shadow's of Amn was called Baldur's Gate 2? Couldn't they have just called it Shadow's of Amn, or the Bhaalspawn Legacy/Saga? I mean, the series, until then, had become part of that saga, with some other media, novels and some TT, I believe, adding to it. The only thing Baldur's Gate about 2 was that it had some of the same characters in it, with the same protagonist, if you imported one from the first game, which wasn't required. Other than that, it was just brand recognition, right?
Can you explain what you mean by this? I'm not exactly sure I 100% understand your reasoning/point.
BG2 continued the overarching story of BG1, that of the Bhaalspawn, using mainly the same mechanics/characters/region, making it a sequel in the truest sense. No? It certainly used brand recognition, but the use of "2" in the title was justified..?