Zachary Woolfe: “The centrality afforded to conductors makes them appear indispensable. It inclines institutions to look past obvious problems and try their best to make their relationships with their maestros work, at most any financial or moral cost. The way some conductors have abused their power — Charles Dutoit, like Mr. Levine, has recently been felled amid numerous accusations of sexual misconduct — is a function of being granted so much power in the first place.”