I think its because a lot of ppl don’t know what your asking for exactly. The AI world moves fast and their is a lot ot learn and know about, and I don’t think their are a lot of people who take/have/do the time to learn things like ‘captioning’ (to me when i read it i thought of putting words into your images, then tags, then models/loras that use tags as prompt inputs, that it had something to do with photoshop, and finally back around to old tv captions).
Then again I’m new to this and these are just my thoughts, captioning isn’t a topic ive actually had with at any point in time.