As for the un-masking, again I too appreciate that it was there in the respected film version, but it's a NEW production. So the director should not be blamed for creating his own version of the same story because that's exactly what he was paid to do, I imagine.
He can if he uses bad judgement as he might have done in this scene.
"Kind hearted" is hardly all that Christine was at the unmasking in the original. She was also disillusioned because she had been lied to and suckered down into the Opera House cellars by someone she naïvely had thought was, perhaps, an angel sent by her father. She now knows he's just a man, and if she is POd, I can't blame her.