Have you ever helped people use their computers by talking to them over the phone, without seeing their screen? It can be frustrating if they tell you mostly irrelevant details that bury the important stuff.
This is the major problem with image description by AI. AI has no idea why the image was posted, so it gives irrelevant details.
Human-written image descriptions are much better at communicating an image's purpose.
More accessibility tips: https://fedi.tips/how-do-i-make-posts-more-accessible-to-blind-people-on-mastodon-and-the-fediverse/
I have stopped putting those descriptions on my images I had no idea what horrific problems they cost