EUDI wallets are moving from theory to production, but selective disclosure alone will not solve the harder problem of trust at scale. As wallet-based interactions begin to scale across organisations, relying parties will have to solve for more than credential acceptance: they need zero-knowledge proof, orchestration across old and new identity systems, resilient fallback when wallet journeys fail, and revocation-aware trust. This session examines the practical design choices that will separate real-world adoption from another standards success story.