The reason is simple - it's safer. Diving nitrox and following the air profile reduces the risk of nitrogen narcosis but at the same time reduces the risk of CNS (which is a very serious risk in diving nitrox). It also allows you to keep lower PpO2. So I myself do this quite often - dive nitrox but using air tables instead of nitrox ones.htn123:Mania,
I haven't dive alot but don't you supposed to set your computer for your dive profile? ie nitrox? why would Elaine comment was to set the computer to air profile?
Mania