For me, 2024 was the LLM exposed as basically pure hype year.
There is no expert of any field I follow online where they're posting up results from AI tooling for any other reason than to show how awful it is. I consider myself an expert in software, and LLMs specifically have only caused me great pain.
Even the one situation where you describe someone describing the ability to work in an absolute vacuum sounds like a huge negative to me. The recent push for DEI policies were even ostensibly about the importance of people of diverse backgrounds and viewpoints working together.
The most important thing you're missing a perspective of scale on is the step you describe as "quality check it". On things I don't know, and have attempted to enlist an LLMs help on, in every case I have had to go back and just actually learn how something works, after time wasted struggling with subtle wrongness in the output.
At least I have the background expertise to do that, however, I have seen a Jr dev's mind get literally rotted by too much time in pure LLM land. Besides the cost of rewriting their code, the company was now the proud owner of a young dev with a mind filled with nonsense.
How do you even weigh the cost of fixing a corrupted human mind?