What's wrong with the medical examination of skilled immigrants in Australia? Will they refuse immigration directly?

According to the law, only diseases that will cause long-term burden on Australian medical care will be refused, such as AIDS and so on. Tuberculosis is also strictly controlled in Australia. It seems that only these two diseases will be rejected directly, and diabetes will not be rejected, but it seems that an extra form needs to be filled out and there is a doctor's treatment plan.