> Regarding these cluster munitions though, other than very densely populated areas, do they inflict much damage ? Are they more powerful than a grenade, say ?

Also not an expert, but I get the feeling that "cluster munitions" is pretty much an umbrella term.

Because of the CCM [1], we tend to associate the term with the "ligther" variants, which are used as anti-personnel weapons. These variants probably wouldn't be much more destructive than a few grenades.

But what Iran is currently using, appears to be missiles with 500-1000kg payload. This puts each submunition in the 50-100kg range. This should deliver a lot more of a punch than a grenade. Also, because of their weight, they probably wouldn't be covered by CCM, had Iran ratified it.

And, yes, it is unsettling geeking out on this stuff, that may actually be killing people as we write our comment.

[1] https://en.wikipedia.org/wiki/Convention_on_Cluster_Munition...

Instead of a cluster of grenades think many drones, the numbers start looking pretty bad when you have 100s of drones rather than a couple of missiles.

Technically those are ballistic missiles with Multiple Independent Re-Entry vehicles not cluster munitions.