Hand grenade toting drones more or less came of age during the ISIS shenanigans and Syrian civil war. Both those conflicts are/were hot enough and had enough state resources pumped in that you had guys taking pot shots at each other with AGTMs. Basically the other sources of casualties were too much background noise for drones to be noteworthy.

When a cooler conflict comes around, think whatever the 2020s, 2030s equivalent of the troubles is, drones will certainly rack up a much greater market share of the casualties by virtue of the lower background noise. They just aren't that useful in a "low but still tons of real armaments around for use" intensity conflict.