How are you going to tell some one there opinion is wrong? Especially when you whole argument is backed up by YouTube, advice from your lfs ( most will say anything to make a sale), and because there's a picture on the box? As bribo said there's also a yellow tang on their, but you agree a tang doesn't belong because you said so earlier. And if you read back neither bribo or I said you can't put an angel in the tank, all we said was that they shouldn't, especially by a new aquarist (this is an assumption, and I apologize Shante if it is incorrect)
My opinions just YouTube ? How about my personal experience? Have you kept a angel in a cube? I have. And it's been fine so I think personal experience might play a factor