MichiGen: this DOES NOT belong into the game, that it's something extra
ERISS: Nothing is extra in a game: it's in, or not. If it officially exists and could be in, and is not in, then it is missing.
Simple, everybody want his game being the more complete.
Well it would not be fair to the people like me who support the devs more than the others if everyone would just got that for free. It's a privilege for being a loyal fan I would say. I find it annoying when everybody is whining how they should have included this or that into the base game. People should stop asking the devs for something that doesn't belong to them.
And it's also just a piece of software. It's up to Larian how they will sell their game. But well, you can try to apply the same logic and go to the Microsoft and ask for Windows Ultimate edition instead of the Home premium because they were released simultaneously and everything from ultimate edition should be in the home premium too, good luck :).