As someone said previously, there arent any safety concerns, and also it may not affect all d600. A recall seems a bit too drastic from the company point of view.
Recall, doesn't mean have to die die call back all affected. They can acknowledge, and thereafter ask those who feel they need a verification to bring their units to NSC. Those not affected, won't be serviced.
There are many ways to get it done, I just think doing it the right way can appease a lot of people.