Agree - domain experts lack the expertise on how things should be built. Developers lack the expertise of what should be built. In each case, one can get into the role of the other, per what you say: "humans who do the translation between those who deeply understand a system and software". LLMs will extrapolate for both (whether it's good or bad)

The only thing missing from the system is the AI GOV that defines the specification of work. Once that is commonplace developers become ephemeral as the code to support the hardened GOV. That is what CANONIC.org is.