Have you ever worked with an intern? They have personalities and expectations that need to be managed. They get sick. The get tired. They want to punch you if you treat them like a 24-7 bird dog. It's so much easier to not let perfect be the enemy of the good and just rapid fire ALL day at a LLM for any and everything I need help with. You can also just not use the LLM. Interns need to be 'fed' work or the ROI ends upside down. Is a LLM as good as a top tier intern. No, but with a LLM I can have 10 pretty good interns by opening 10 tabs.
The LLMs are getting better and better at a certain kind of task, but there's a subset of tasks that I'd still much rather have any human than an LLM, today. Even something simple, like "Find me the top 5 highest grossing movies of 2023" it will take a long time before I trust an LLM's answer, without having a human intern verify the output.