The export is only the first step, not the migration. A file from the admin won’t tell you which addresses actually exist, won’t build a new design or product pages, won’t create the redirect map, won’t carry over the logic from your plugins or connect your carriers, feeds and invoicing – and it won’t check whether prices, stock and variants still add up after the import. For a small catalogue with no history and no rankings, I’ll talk you into doing it yourself. For a store whose revenue rests on organic search, the cost of a mistake usually runs higher than the cost of the migration.