I can’t really think of a case where a post’s image isn’t relevant to the associated discussion. Even if it’s just a nonsense post with an unrelated image, knowing what the irrelevant image is about would help make sense of the discussion.
Not enough info is better than nothing. Because if it’s nothing, you can’t tell if the person who shared the image is lazy or decided the alt text wasn’t necessary for this particular picture
Fedi seems to be really great for accessibility from what I’ve seen. At least I’ve never never interacted with so many visually impaired people before joining mastodon. So I’d say that culture is working.
I believe there’s a nice way to go about (honey v vinegar, etc), but generally yeah, it feels really good to be in a virtual space that is so welcoming.