The code: React and Next.js in TypeScript, written for your pages rather than configured around a purchased layout. Nothing on the site exists because a template shipped with it.
The content system: your own CMS, built to your content rather than the other way round. Changing a price, a page or a case study is a login. It is not a support ticket and it is not a deploy.
The accounts: the domain, the hosting project and the code repository are in your name, billed to you, with the studio holding developer access. That is what makes leaving cheap, which is the point.
The search setup: page titles and descriptions written per page, structured data, a sitemap, and redirects mapped from your old URLs so the rankings you already have survive the rebuild. A rebuild that drops its redirects is how a site loses traffic on launch day.
The rest of it: accessibility and performance treated as targets that get measured, backups configured, and a handover document covering how it runs and how to deploy it. Whether you keep us on afterwards is a separate decision, not something the build forces.