kellogh, alright, i have to declare this as a strong opinion — #LLMs are better at alt-text than people are
the goal of alt text is to let a person “without eyes” see the picture, to get the same experience as someone who can see fine
but often, almost always, human-written alt text is either too succinct to be helpful, or just an extension of the post itself, and so doesn’t help an impaired person understand what’s in it