How scary is the Tyrolean traverse on Carstensz, really?

The Tyrolean traverse on the summit ridge of Carstensz: how bad is it?

Far more of a mental test than a physical one: a steel cable across a big gap, clipped in the whole way. The bigger point is that the summit is only halfway, with the whole ridge and the rappels still to come.

The full answer, kept up to date: How hard is the Tyrolean traverse? The guide chapter: The summit ridge & Tyrolean traverse