Answer engines change the economics of search visibility: instead of twenty results sharing a page, one answer cites two to six sources. Winning a citation therefore carries more of the traffic and trust that a first-page ranking used to, and losing it means invisibility rather than page two.
Engines choose sources they can extract cleanly and attribute confidently: direct answers near question-style headings, consistent facts across the site, structured data, and corroboration from other authoritative pages.