No, that makes them lazy. Is the job of the designers to create NEW content that presents NEW challenges and NEW ways to defeat those challenges. Your argument that 300 weapons were still used is invalid. Just because people used them didn't make them effective. It meant people liked them and don't want to see them gone. Ultimately, it is that very argument which shows they need to be kept active and strong. Not discarded. What's happening is very simple. 2 full raids and an arena that are now gone and new players will miss the joys of. Which is why wow revamped and upgraded and made useful those old raids, to keep that content flowing and active.