The key point about drone warfare, at as it appears to be practiced currently, is that they're using the drones down to the individual level.
That is, they're taking a drone and targeting individual soldiers. This is how cheap the drones are. A soldier seen hiding behind a tree is a target of opportunity. Combined with the pervasive and, again, cheap surveillance, it makes for very harrowing experiences on the battlefield. Add in autonomous behavior, and it just gets worse.
I did have the fortune to see a drone show at a recent baseball game, it was really nice. They would make animated, 3D figures in the sky. They claimed they were using 800 drones for it. It was a really neat experience to see.