Well, I think they were referring to the fact that BP's are generally private snakes ... being that their natural defense is to curl into a ball.... I don't think 4x2x2 is too big but I would give extra hides and an extra water dish just because it stresses the BP's out to be exposed for the aforementioned reasons. Plus each BP is different so yours may be doing fine in that size with only two hides but especially if they plan on getting a babie, yearling or even juvie a 4x2x2 might freak them out and cause un necessary stress.