Because when providing NEW owners with advice you shoot for what will work to provide an optimum environment until the said owner understand his animal and can experiment, not only with hides but other things as well.
There is a difference between recommending what will work with a new owner and what an advanced owner would do.
I obviously don't recommend things like don't use hide, hot spot, thermometer/hygrometer in the enclosure, feed on arrival etc.... yet this is what I do.