A site designed in a visual builder looks finished and is not. It is difficult to extend, awkward to connect to real content, and the performance and SEO characteristics are whatever the builder decided. Rebuilding it in code risks the opposite failure: a maintainable site that no longer looks like the design everyone approved.
Treat design fidelity as an acceptance criterion rather than an aspiration. Rebuild in components, comparing against the original at each breakpoint, and take the opportunity — while rebuilding — to add the CMS integration, metadata and asset handling the visual build never had.
Detail
Visual builders are excellent for deciding what a site should look like and poor at being the thing you maintain for years. I treat the rebuild as the point at which a design becomes software: components, content model, metadata and performance all become things somebody owns.
Stack
The decisions behind the build