> If a junior makes a mistake and it will not be caught in time they will automatically learn.

I think this sentiment applies well to junior software engineers (with mentorship). But imagine the much larger swaths of entry level employees in operations, support, or sales functions. When you have a 400 person team with 20% annual turnover (since people move in / out of entry level jobs frequently), the management + training + monitoring becomes a huge challenge.

I think the typical HN sentiment of "llms aren't deterministic" fails to take into account how non-deterministic giant groups of people are. Every group of 10 people typically needs a manager. And every 10 managers needs another manager. By comparison the engineering work on dialing in your LLM guardrails feels pretty worthwhile.