I hate it.
Black Bolt should not speak. That should be like the cardinal rule for ever using the character unless he's blowing crap up with his voice. We mere mortals should not know what the King is thinking. I don't even think we should ever really get a feel for what type of personality he really has.
His whole not talking shtick is great. He's like the angel Metatron whose voice isn't meant for human ears or Zeus whose real form destroyed Dionysus's mother Semele.
To have him speak is to make him a commoner and robs him of his majesty and his mystery. He should be better than that.
All of those reasons are why I think he was generally a horrible character for decades. Nor do I like what you attribute to kings, and especially shouldn't have godlike qualities. The only king I ever liked was Aragorn because he was for all intents and purposes a commoner (and because his story pretty much ended at the crown).