My true from is about 300 meters tall, and any human who lays eyes on it would have their eyes burnt from their head. My true voice is... also impossible for them to hear without being damaged. And yes, all angels are beholden to this restriction.

It's inconvenient, admittedly. I'd rather not have to possess a human to live among them— But we were created first. So really, it's their design that's inconvenient.

[ castiel plucks at the lapel of his coat half-heartedly. he doesn't seem offended in the least. but, well, he's heard far worse. most people reacted fairly negatively to meeting him when he first set foot on earth. ]

I always assumed there was some reason for it, but God doesn't talk to us any more than He talks to them.