Reality is much more complex than that. Google's index has been tiered for many years, see e.g. https://search.googleblog.com/2012/05/search-quality-highlights

Reality is much more complex than that. Google's index has been tiered for many years, see e.g. https://search.googleblog.com/2012/05/search-quality-highlights-53-changes.html https://search.googleblog.com/2012/05/search-quality-highlig... • New index tier. [launch codename "cantina", project codename "Indexing"] We keep our index in “tiers” where different documents are indexed at different rates depending on how relevant they are likely to be to users. This month we introduced an additional indexing tier to support continued comprehensiveness in search results.