The article is from Europe, right? Is there a debate about this subject going on there? I know alot of European hobbyists prefer naturalistic vivaria. It seems the article was meant to answer an argument over suitability of plastic tubs. As has already been said I like racks for secretive terrestrial snakes like BPs and Corns. I keep my Carpets in PVC display cages however. They seem to really thrive in them, always out perching or exploring. They never hardly use their hides even though they have plenty!