It does make sense in asymmetric warfare. Drones will be no problem for destroyers with CIWS , but against a land target it will be using up the defensive ammo again.
CWIS is a radar directed computer controlled gatling gun system. Cheap ammo, and accurate. Drones against a city likely mean patriot interceptors.
Having said that, the sea is rather crowded, so CIWS could do a fair bit of collateral damage. So maybe it's because UAE have been most hawkish ?
I expect we need to wait for Trump to TRUTH the reason.