Why do Icelandic and Faroese preserve many older Scandinavian language features?

Icelandic and Faroese are considered the most conservative of the Scandinavian languages because they have preserved many grammatical and linguistic features of Old Norse that were lost in continental Scandinavian languages like Danish, Swedish, and Norwegian.12

Several factors contributed to this preservation:

• Geographic Isolation: The remote island locations of Iceland and the Faroe Islands sheltered these languages from the linguistic shifts and external influences that affected continental Europe.1
• Literary Tradition: In Iceland, the continued use of the language for sagas, Eddas, and other literary works helped maintain the language's structure.1
• Linguistic Purism: Particularly in Iceland, a strong puristic movement beginning in the 19th century actively replaced foreign loanwords with native elements, further insulating the language from outside change.1
• Orthography: Both languages adopted etymological orthographies—writing systems based on the history of the words—which helped maintain a visual link to their older forms.12

As a result, modern Icelandic retains complex systems of cases, genders, and verb conjugations that have remained largely unchanged since the classical period.1