I think the author is being overly pessimistic with this. The positives of an LLM agent outweigh the negatives when used with a Human-in-the-loop.

For people interested in understanding the possibilities of LLM for use in a specific domain see The AI Revolution in Medicine: GPT-4 and Beyond by Peter Lee (Microsoft Research VP), Isaac Kohane (Harvard Biomedical Informatics MD) et al. It is an easy read showing the authors systematic experiments with using the OpenAI models via the ChatGPT interface for the medical/healthcare domain.

For a current-status follow-up to the above book, here is Peter Lee's podcast series The AI Revolution in Medicine, Revisited - https://www.microsoft.com/en-us/research/story/the-ai-revolu...

Instead of reading trivial blogs/tweets etc. which are useless, read the above to get a much better idea of an LLM's actual capabilities.