There's no point in arguing over it if no one supports their side. The only evidence I've seen in support of either side is in the devourer bias topic, which seems to show that devourers don't like aether. Off the top of my head, I don't remember seeing any other data about randomness on the forums.
That being said, I'm making a topic right now about deck shuffling, and once there is enough data on it, we'll see if deck shuffling is truly random.