When summarising beats reading the full document
Research papers, earnings calls, legal briefs and meeting transcripts exceed what one person can skim in a deadline window. Summarisation extracts the thesis, key arguments and action items so you decide whether the full document deserves deep reading.
Adjust summary length to your use case. A 20% summary for executive briefings. Bullet key points for study notes. Always verify facts against the source before citing summaries in published work.