Paper abstracts are not optimized by drive-by readers like you and me. They are optimized for active researchers in the field reading their daily arXiv digest t

Paper abstracts are not optimized by drive-by readers like you and me. They are optimized for active researchers in the field reading their daily arXiv digest that lists all the new papers across the categories they work in, and needing to take the read/don't-read decision for each entry there as efficiently as possible. If you’ve already decided you’re interested in the paper, then the Introduction and/or Conclusion sections are what you’re looking for.