Google's ranking algorithms deploy search crawlers to index and evaluate all manner of websites and individual pages in terms of how high they should appear in search engine results pages. The algorithms happen to be in tune with the reality that a typical website has broad categories of page content that would warrant being reevaluated at different rates of frequency. Google will therefore have its crawlers sift through pages featuring static and persistent content less regularly than through any segment of a website that is clearly devoted to regular blog posts. This makes logical sense because a website's blog is typically where the most relevant topics of the hour are presented to audiences that are invested in the industry the site's content covers. Audiences are naturally inclined to look at the blogs far more frequently than at other pages of the site, whereas individual pages that have existed for a while are often where generalized and introductory information about the website and its industry remain in place for the benefit of laymen. Search crawlers will obviously check these pages routinely for any updates that have been recently applied, but they will check blog posts more often because the website's editors usually perform the brunt of their ongoing work there. The owner of a website is inclined to keep a lot of the informational content being presented in its blog section within that section's archives instead of converting every post into its own persistent page elsewhere on the site. Google measures persistent pages under the assumption that they are "important" pages, but if the vast majority of the site's content occupies pages that all try to feel "important" simultaneously, Google might interpret them to be less so and therefore grant less SEO credit to them. It helps a website's SEO when blog content that clearly pertains to current events is not preserved as individual pages because Google will be allowed to consider the other pages to be more important than blog posts that will obviously become less relevant as time causes the topics they covered to become less "current." For more information click here https://www.reddit.com/r/SEO/comments/a46z7u/wordpresssiteshouldiusepagesorpostsfor/.