Whatever makes sense, or good taste won't be the way a storyline goes. Witness how disgusting the formerly funny Leo has become.
Yes, Days seems to be dredging up old history, puzzling a lot of viewers who have not the slightest idea what the references have to do with anything. Currently, the prisms are needed to help the 3 women who are dead.....or not. Years ago they were needed to cure Stefano's brain tumor.
Various adventures secured the 1st one, then the 2nd, and finally the 3rd.....which I understand was dropped purposely into the ocean by Andre. But like everything else in Salem, nothing is ever really lost, no one really dies, unless they are being written out. Notice that Victor has not suddenly fallen ill, had a stroke while visiting Greece, etc. He is just "out of town", & Maggie becomes his voice, relaying his comments and decisions.