Generic migrations lose it silently, and it is usually the most valuable content on the site. Code blocks are where hand-added work tends to live: tracking, embeds, forms, custom markup, and the structured data that makes pages eligible for rich results. That content is not stored in a way a text-scanning tool can see, so it is not flagged and not carried forward. The site comes out looking mostly fine while missing the parts that were doing the technical work. We recover this content as part of the migration.
