There is nothing WotC or Larian can do to keep players from playing THEIR game THEIR way. So if someone wants to play the game with alignments, they can. Even without the labels, one can identify certain actions as good and others as evil. So, for example, I don't need Larian to tell me Shadowheart is evil. If I as the player find her to be evil, then she is evil. All that matters is whether Larian has set up biased roadblocks within the game to try and prevent me from treating Shadowheart as evil.
What do you consider biased roadblocks? Characters shouldn't act only of their alignment. If Shadowheart does good things and likes if you are nice in some situations, this to me makes her have more depth. Same thing with a good character, they should have moments where they aren't so nice. None of this should prevent you from forming an opinion about any character and treating them accordingly but it should make you think a bit.
I am kind of glad they are not obsessing over alignment and wish they would take out the cleric tag for it as well. A lot of players jump to instant conclusions about a character once they find out the alignment and this is just stupid. Even players often limit themselves to acting only within a certain alignment if forced to pick at character selection instead of freely doing whatever they feel is right at the time.