I noticed most wordpress themes use breadcrumbs but "hard coded" without any structured data. So even though the breadcrumbs appear on the page, it's just normal markup without any data-vocabulary or schema properties.
My question is, will search engines still pick up on them? Are there any benefits ( from a search engine point of view , not the user's ) of using them at all without structured data?
I ask from an SEO point of view, not the visitor's, because the visitor will obviously benefit from them regardless of structured data or not.