The major development in warfare in the 21st century is not the drone, as might be supposed, but the manner in which weapons are used. Primarily war is now waged against populations and civilians and only secondarily against military objectives. The secondary measure is the destruction of a nation’s economy and in particular its energy sources.
We see this clearly in the eradication of Mariepol by Russia at the beginning of that illegal invasion of a peaceful neighbour, and in the repeated attacks on energy generating stations. But this is not alone. We see the same approach adopted by Israel against the Palestinians in Gaza and the West Bank, and against the citizens of Lebanon, under the excuse of annihilating leaders of factions that Israel does not like or deems to be terrorists. (sic).
Meanwhile America has joined Israel in its illegal attacks on Iran and continues the same approach to the civilian population being a legitimate target. The first target by America was a school filled with children and their teachers.
The introduction and widespread use of drones is simply a development in the instruments of war, not a change in the approach to war.
Nor are these the only examples we can find. Sudan also shows the same approach. The idea is to cause alienation between the population and the military aspect of any particular state. It represents a cynical development in the mindset of governments and leaders of those aggressive factions.