The fact that sites not written in code are poorly promoted by SEO is a myth. In short, the constructor offers not so few opportunities. To be more specific, constructors that we use can prescribe and mark headers, meta-data, set canonical, translate site to secured protocol (https), prescribe 301 redirects (with www and https), prescribe OG-pagination, close pages from indexing, form xml-map of the site. Plus sites are adaptive by default and without duplicates.