Is it? With a 3d printer you can print any piece on demand, change design without changing tooling and make pieces that are semi-hollow inside for lightness.
Edit - should add, early in the war Ukraine was crowd-sourcing drone parts from citizens with 3D printers at home. This likely grew from that.
This isnt endurance contest, interceptor drones are half battery half explosive with miniscule weight taken by motors electronics and packaging. We are talking 10KW power draw for around a minute.
You can rapid manufacture moulds too, cnc alu is good for 1K shots easily.