Different articles are worthwhile to different people. Abstracts help people find content they are interested in, reduces incentives for clickbait and burying t

Different articles are worthwhile to different people. Abstracts help people find content they are interested in, reduces incentives for clickbait and burying the lede, and focus discussion on the main points. Of course bad summaries can be bad for the discussion, but that's what downvotes and criticism is for. The same is true for normal comments.