doesn't that mean you spend time reading the summary of articles you wouldn't have read on your own, and thus it wastes time?
In any case, reading summaries (and occasionally following up by reading the full article) is more enjoyable and you learn more per unit of time. Most articles are mostly garbage. And even insightful and informative articles can often be compressed with minimal loss of conveyed insight and information. Typical example is some of Paul Graham essays (I say some because only some are worth reading).