Making text flow naturally, grouping and ordeeing information, good writing.

You can verify two textst have the same facts and information, yet one reads way better than the other. But writing a text that reads well is quite hard.

You were thinking logically about a normal production chain. In that case, QA or whoever says "This is wrong, rework it and correct the issue" and that's that. With AI, it does the whole thing over again and may or may not come back with the same issue or an entirely new one.