This is why building a "dark factory" is hard; at a certain point, you need to either externalize all that information into a "digital twin" of yourself, or you have to stop caring what gets built.
This is the thing though, prioritization doesn't matter in the same way it used to.
We only needed to prioritize before because engineering was relatively slow and precious resource, so we had to pick and chose what to work on first because it took time.
But now we effectively have a limitless supply of SWEs, so why not do everything on the backlog?
I think the question now is more about sequencing than prioritization. What do we need to do first, before we can do these other things?
But yes generally requirements are still very important. Which features do we need etc.
In other words, engineering gets faster, but prioritization and decision frameworks start to matter more.