For something like HALE drones(think something along the lines of Predator/Reaper) which has an air to ground tasking - absolutely.
A SAR(synthetic aperture radar) capability allows it to have precise targeting, which normal radars can't do.
An AESA SAR radar will have an even better picture than a PESA radar due to how it works.
From a PESA APG-73(SAR capability) installed in a F-15E:
View attachment 211105
From a standard radar installed in a F-16:
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View attachment 211107
As you can see SAR mapping makes a world of difference when you can generate real time, really precise maps that you can use. And air to ground attacks are just a subset - imagine fitting this on a drone, having it run a SAR process on the enemy ground, and getting near instantaneous images of enemy personnel, their vehicles, the size of their cigarettes in high resolution. ISR and situational awareness would never be so high.