I think what makes the face look stiff is because they didn't use facial capture but has the high-res cutscene rendering feel, so people tend to expect more nuanced facial expression, while they are probably just using a composite of blend shapes.
My bet is on the sunset of this feature coming very soon. For better or worst, the game can't stand on itself in 2019, but the rulebook is also annoying, funny, but annoying.
df's comments