That seems like a weird thing for Google to intentionally break. I’m guessing there’s a more technical reason.
For example Google probably directly indexes by keyword. So “foo bar” probably searches the union of all “foo” and all “bar” pages for “foo bar”. But if the page changes since indexing, they will serve matches that aren’t actually matches. Or websites might game the indexer so that “foo bar” isn’t actually visible but it shows up on the Google search page.
For example Google probably directly indexes by keyword. So “foo bar” probably searches the union of all “foo” and all “bar” pages for “foo bar”. But if the page changes since indexing, they will serve matches that aren’t actually matches. Or websites might game the indexer so that “foo bar” isn’t actually visible but it shows up on the Google search page.