> The hiring for those roles might be closer to "knows our domain well" than "knows the tech stack"
This does seem likely to me, no matter what. But:
> Will software developers be the ones making it, or will it be the experts in the relevant domain?
In World #1, I imagine there will be someone whose job it is to produce the software, yes, and they'll probably do a much better job if they have a strong conception of how software and computers work.