>Yes, you can probably build a cheaper Tomahawk missile today. However, can someone else build a cheaper drone that is even better for the battlefield theaters of the next several decades?

I heard the US produced knockoffs of the Iranian ~$10-50k drone and produces it for ~$35K and its a modular and an upgradable platform (ie. not just a dumb copy). If you ask me, that ability to not only produce castles but also 'cheap cannons' as per your analogy when needed for cheaper and then improve on top of it is a pretty darn good skill.

[1]:https://en.wikipedia.org/wiki/Low-cost_Uncrewed_Combat_Attac...