Larian Studios Forums Baldur's Gate III Baldur's Gate III - General BG3 will NOT have ALL PHB Content

"There are things we are not putting in, and there are things we are putting in. We are trying to give ourselves a little maneuvering room by not announcing everything."
The question does mention the PHB but the question ultimately was "Is that the end goal, getting all of 5e in?" Which is considerably broader of a question than the initial start of talking about PHB. All of 5e is PHB, DMG, XGE, TCE, SCAG, EGW, MM, Eberron, VRG, EEC, VGM, and an upcoming dragon book. And I didn't even go into specific campaign modules and things they add. 5e is huge, and it is clear they will not add all of 5e. But based on other interviews, all the player content of the PHB is definitely being added. And in fact, I want to ask, "Why do you think it will not be added?" Tbh though, there are some spells from PHB I think won't be added because they are functionally impossible, such as Message, but when I say "All" I tend to mean Classes and Races.
Do you think it is logistically improbably? Would it cost too much? Is it too ambitious? This isn't me trying to build a strawman, I just don't know exactly the why you believe this and I want to know, to both understand and possible argue against because this is a topic worth discussing.