2/ If you look at modern software development it is, to me, obvious what the factory is an example of: It's a CI/CD pipeline, it's basically DevOps tooling and monitoring. A similar architecture exists for other computer programs that do this type of process: take various pieces of stuff and compose them together. You'll see that architecture in audio and video processing/mixing software, a well known OSS example is ffmpeg. But you also see it in operating systems for example in composers like Wayland or X11.
Basically: there are no actual people in the factory in software development. Lean Software dev is a massive misunderstanding and so is by extension Kanban etc
I should really write a blogpost or something on this.
But if you read Toyota Way you will see something that looks a lot like software dev, but it's not very prominent: it's the people designing the factories and the people designing the cars.