It’s the software. Definitely. We been making bombs for a while now. They used to toss them out the side of biplanes. Oddly, your second paragraph immediately undermines the first.

> Presumably, the world used dumb munitions without any software for a long time.

What do you think “presumably” is accomplishing here? Are you unsure, but willing to assume for purpose of the discussion, that bombs preceded computers?

Did those dumb bombs tossed out of biplanes lack software because the software was difficult to write or because there was no hardware in the world capable of running software? Given that missile guidance systems predate the very notion of software, and the moment better hardware exists there is software ready to take advantage of it, methinks software was not the hard part.

I promise you, the software is not the hard part.

We've been making PID loops for a lot longer.