Gantt charts are indeed a tool and like every tool one has to be careful to apply it in the right situation. The problem with some (many?) project managers is

Gantt charts are indeed a tool and like every tool one has to be careful to apply it in the right situation. The problem with some (many?) project managers is that they don't make that distinction. They just try to apply the same tools to every situation. Gannt charts for example are relatively useless to model processes that involve a lot of unknowns or branching paths. And of in such a project they are relied uppon they can become actively harmful. But this can be the case for literally every other PM tool.