"Setting" a Self-adjusting Clutch

[4x4junkie]

Seems unnecessarily complicated. Isn't the purpose of the self adjusting just to maintain pedal height as the clutch wears?

That's exactly what it does... Except that we have hydraulic-operated clutch systems (not cable-operated systems), which by their very nature are already self-adjusting...
What does a "self-adjusting" clutch do exactly in this application and why are they even available? (obviously I must be missing something )