The Arabic rollout's quality benefit extends beyond Arabic: a language-switcher bug from the Russian deployment was discovered only during Arabic page creation, when Sonnet 5 noticed links pointing to homepages instead of matching topic pages. This demonstrates a positive externality of language expansion — each new language validates the infrastructure for all previous languages. The bug would have remained undetected if Arabic hadn't been added, since the Russian rollout's 17,000-link check found 'ZERO broken links' — the bug was in link targets, not link validity.