By placing content in logical topic silos the content of a site is structured in a way that helps support the overall topic.

In turn, this builds authority for the subject(s) you are creating content around.

This is where Google’s E-A-T concept comes into play.

The better a site can establish itself as an authority for a subject, the more chances it will have to rank for relevant queries within search engines.

Similar to search engines, if a site creates useful content that resonates with users and helps answer their questions there is an increased chance in that user building recognition for the site around the subject.