> sounds like alot of work and expense for something that is meant to make programming easier and cheaper.

It's not more work; it's a convergence of roles. BA/PO/QA/SWE are merging.

AI has automated aspects of those roles that have made the traditional separation of concerns less desirable. A new hybrid role is emerging. The person writing these acceptance criteria can be the one guiding the AI to develop them.

So now we have dev-BAs or BA-devs or however you'd like to frame it. They're closer to the business than a dev might have been or closer to development than a BA might have been. The point is, smaller teams are able to play wider now.