Due to a society that runs to lawyers who sue every possible time something "not right" happens, companies must protect themselves from product liability lawsuits. There are lawyers who are just drooling to find a case where they can sue for big money when something goes wrong. I call them "bloodsuckers" because they create nothing, only destroy things, and cause us all to spend huge money to protect ourselves (or to protect the company).
Unfortunately, that's the society we have. Aqualung must operate in a manner that protects them from predator lawyers. I fully understand their stance. If you don't service the reg according to their service recommendations, you take your chances. Just like driving your car without doing oil changes... you may get lucky and get many miles out of it, but don't blame them when it fails. Just remember, it's life support equipment, is it really worth taking a chance??? If you chose to service in some other way, then it's your responsibility. (Let the flaming begin.)