I once saw a ten year old goldfish, still in good health, being kept in a five gallon tank with dirty water over aquarium rocks. Just because an animal is in good health doesn't mean the conditions it's being kept in are correct. People that know a lot more about keeping these animals than you do are telling you that certain aspects of your husbandry are incorrect; I'm not sure why you insist that you've discovered better ways to keep them when you have no experience that would give you information that everyone else hasn't taken into account.
Pacs are tough to kill for frogs; that doesn't mean that any condition that doesn't kill them is correct.