One country does not always mean one locale. The right Shopify Markets setup depends on whether different language groups need distinct SEO, trust, publishing, or policy coverage strong enough to justify another storefront layer.
A single country can contain multiple commercially important language groups that do not behave like one generic locale.
Different language groups inside one country may search differently, respond to different category wording, or require stronger policy clarity.
Each added locale means more publishing, QA, metadata, and support work, so the split has to be operationally justified.