Health tests are the number one thing that discerns between a responsible breeder, and those just churning out pups. Why should you get a dog from a breeder who health tests? Sure there is no absolute guarantee that you will get a 100% healthy dog just because health tests are run. These are living beings and genetics and environment play a role. There is also no guarantee that a seatbelt will save your life if you get in an accident - but it sure does increase your odds.
There seems to be a lot of confusion over what health checks are. Health checks are not just 'I brought my dog to the vet and the vet says all good!'. They are also not just I ran an Embark on my dog. While yes, Embark and other DNA testing companies test for hundreds of genetic diseases, only a handful of them affect malamutes. In other words, the majority of diseases they are testing for don't even exist in the breed. DNA testing can be used as an informational tool in breeding decisions, but they have nothing to do with the physical examinations of hips, elbows, eyes, heart, etc.
The minimum health checks required by the Alaskan Malamute Club of America are X-raying hips, eyes checked by an ophthalmologist, and a DNA test for Polyneuropathy. Many go beyond this, regularly X-raying elbows, cardiac and thyroid tests. In the US, breeders register these test results with the Orthopedic Foundation for Animals - http://www.ofa.org. The OFA site has a searchable database, and contains generations of health tested dogs.