I think optimising for that just leads to another kind of SEO slop. I mostly use the summaries for answers to questions like "what's the atomic number of aluminium". The sensible way of laying this out on a website is as a table or something like that, which requires another click, load, and manual lookup in the table. The summaries are useful for that, and if the websites want to answer that question directly, it means they want to make a bunch of tiny pages with a question like that and the answer, which is not something I want to browse through normally. (And indeed, I have seen SEO slop in this vein)