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Security in a financial product is not a cost centre and not a checkbox — it's a feature users pay for. Banks compete on trust. The mature product-security org treats every shipped feature as having a security column on its specification: who can do this, what could go wrong, what's logged. Skip that column and the feature is incomplete.
Recommendation: treat security like accessibility — a non-negotiable design dimension. Every PRD has a 'Threats + Controls' section before engineering starts; every release has a security sign-off; every quarterly review reports security metrics alongside growth metrics.