[Spooky23]

Artillery and air power killed fortresses. De-industrialization and technology pretty much killed artillery And sustained air power engagements seem to be difficult for the same reasons.

Drones democratize airpower but have significant limits.

[delfinom]

Killed artillery?

No, pretty sure every western country is still racing to increase artillery production, though rheinmettal is not up to a million shells per year. The war in Ukraine fully demonstrated that when the enemy is actually at your level and not just some cave dwelling terrorists, it becomes a war of attrition with every weapon system possible.

[Spooky23]

In Ukraine, that was last year. The persistent drone surveillance and strike capability and fire radars have made them very vulnerable to counter battery/drone fires.

The failure of legacy air power to sustain in a hostile environment led to the WW1 style artillery duels. From what I gather in the public domain, drones have created kilometers deep kill zones where nothing can survive. That’s capability that I think is exclusive to the US sans drone.