I've always been told that royal pythons need smaller vivariums as the feel more secure, this actually happened in my college when a royal was moved to a larger viv. He didn't eat and he became snappy so he got put back in his old viv and now he's fine. We did this under recommendation from an excellent and very well renowned reptile shop.
And this viv seems to be about 9 feet long, 6 feet deep and about 7 feet high? That's a pretty big amount of space for burms, I can't see how you can find this inadequate? I've seen many exhibits for this species that was smaller.
I guess we'll have to agree to disagree.