To clarify, I was making a broad statement about automation in general. Running an automated loom is more efficient in every way that getting humans to weave cloth by hand. For most tasks, automation is more efficient.
However, there are tasks that humans can still do more efficiently than our current engines of automation. Go is a good example because humans are really good at it and it AlphaGo can only sometimes beat the top players despite massive training and inference costs.
On the other hand, I would dispute that LLMs fall into this category, at least for most tasks, because we have to factor in marginal setup costs too. I think that raising from infancy all of the humans needed to match the output speed of an LLM has a greater cost than training the LLM. Even if you include the cost of mining the metal and powering the factories necessary to build the machines that the LLMs run on. I'm not 100% confident in this statement, but I do think that it's much closer than you seem to think. Supporting the systems that support the systems that support humans takes a lot of resources.
To use your blueberries example, while the cost of keeping the blueberries cold isn't much, growing a single serving of blueberries requires around 95 liters of water[1]. In a similar vein, the efficiency of the human brain is almost irrelevant because the 20 watts of energy consumed by the brain is akin from a resource consumption perspective to the electricity consumed by the monitor to read out the LLM's output: it's the last step in the process, but without the resource-guzzling system behind it, it doesn't work. Just as the monitor doesn't work without the data center which doesn't work without electricity, your brain doesn't work without your body which doesn't work without food which doesn't get produced without water.
As sramam mentioned, these kinds of utilitarian calculations tend to seem pretty inhuman. However, most of the time, the calculations turn out in favor of automation. If they didn't, companies wouldn't be paying for automated systems (this logic doesn't apply to hype-based markets like AI. I'm talking more about markets that are stably automated like textile manufacturing). If you want an anti-automation argument, you'll have a better time arguing based on ethics instead of efficiency.
Again, thanks for the Go example. I genuinely didn't consider the tasks where humans are more efficient than automation.
[1]: https://watercalculator.org/water-footprint-of-food-guide/