A Super Star Destroyer can overburden a fragmented empire

After Palpatine's fall, would a Super Star Destroyer be an asset or a liability to an Imperial Moff?

A liability because of the enormous infrastructure needed to support it.

The ship's support requirement makes it a liability in this Star Wars scenario. Possession of the warship does not establish that an individual governor has the infrastructure needed to sustain it. The judgment rests on that logistical burden, with no detailed comparison of combat performance.