The thing is that the more races they added, the more diluted and more work they have to put into the dialogue options, time is a limited resource, and it's at the point whether they want to focus on the gameplay aspect, expanding more story, or adding races. No, they can't do all of them. It is just not possible as time and development cost will add up, and the opportunity cost will be taken from another aspect. There are a lot of interesting races, and yes, they will be adding more in the final game. With monster races, it would especially more difficult to add without completely different reactions. If they do it just for cosmetic purpose and NPCs just react to them the same way then there is really no point. The monster race would just be skin instead of bearing any significance. I would rather for them to focus on the races they have and do it well. While people appreciate the freedom and customization in Western games, most players play the game very generically, Larian already said that most people play as a boring humans and a major majority sided with the good faction. It's not just in this game, but many other games from what I have read. With that being said, I do like variety in these games, so even only a minority of people use these options to play as other races or being evil, it's still nice for replay value and freedom. With that being said, they should focus on providing a complete experience for the game and building up the contents for the existence races and the additional races they plan to add instead of trying to add as much things as possible while neglecting other aspects. Monster races like goblin would be one of the things that may be best to leave out at least for the launch version.
