People on this forums are continuously surprised that a videogame, which has to have all its content pre-created and inserted into the game ahead of time is more limited than what you can do with the power of imagination carefully regulated by a human controlling every step.
Play Baldur's Gate 1 and/or 2 with a character you create. Then try it/them with one of the pregen characters. There is a difference. Perhaps not a significant one for yourself if you have done this (which is cool), but for many of us, it makes all the difference in the world. I'll not argue that games are, in their entirety, pregenerated content. Naturally they are, but the feeling/illusion of contributing, however minutely, your own little piece of creation within it is priceless to many who play them (certainly is for me). It's certainly not a mandatory thing to achieve in any game, even an RPG...but it is quite important to many folks when the potential for the option exists, especially when it's been there for previous entries in the series.
This game will have that, to be sure, though it certainly seems to be less of a priority for Larian than ensuring the pregens get all the attention they can muster for them. Now that's just a guess based on what's been revealed, which is admittedly not a great deal, so I (and others saying similar things) may be entirely off base in voicing these thoughts/feelings/opinions. As more and more is revealed I have no doubt my thoughts will change based on what new information comes to light. Time will tell.