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honestly, you’re right. I still worry that it could encourage an attitude of abled people not caring about alt text, because “oh well AI’s gonna do it anyway, who cares!”, but, really, abled people already don’t care about alt text, so…
In the specific case of PDF most users wouldn’t even know where to add an alt text. Depending on how you generate the PDF it might even be impossible. So I think Mozilla has the same concern as you, and that’s why they aren’t adding this to images in HTML (yet).