Verdun fortifications and the operational trench line

Did the defensive lines around Verdun fail, with poor German leadership alone preventing their exploitation?

The fortification system worked reasonably well. The operational trench line broadly followed the fortification belt despite the system's problems.

A viewer claims that the defensive lines around Verdun failed and that poor German leadership alone prevented exploitation. The response argues that the system worked reasonably well despite real problems. Trench maps show the operational line broadly following the fortification line. The operational effect of the forts is the measure here, since the system shaped where the armies fought without creating an impenetrable barrier.