Most security incidents don't happen because someone missed an alert. They happen because a policy was set once, for one situation, and nobody updated it while everything around it changed.
I've spent four years working in that gap - Conditional Access, DLP mapped to compliance, mail flow rules that hold up under real attacks. Once, that meant hybrid identity for 60,000 banking users - ADFS, WAP, Azure AD Connect. I didn't call it done until I'd broken it myself in a lab, on purpose, until I knew exactly how it would fail before it touched production.
The part nobody sees is automation - PowerShell scripts turning multi-day provisioning into minutes. Right now that same approach is going into email security - DKIM, DMARC, anti-phishing tuning, the layer people only notice once it's broken.
The infrastructure people trust most is the one they never have to think about. That's not luck. It's a choice.
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