Why Google Announces Some Search Updates But Not Others
TLDR
Google announces only its largest, most impactful core updates so publishers can distinguish algorithm changes from their own technical issues.
Optimixed Overview
Optimixed's original report on this story.
SERoundtable explains Google's reasoning behind selective disclosure of search updates: the company reserves announcements for substantial core and algorithm updates that meaningfully affect site performance, allowing publishers to rule out their own infrastructure or code as the culprit when rankings shift. Smaller, routine algorithmic refinements ship without fanfare.