I am also ex-FAANG (recently departed), while I partially agree the "policy-people" pop-up fairly often, my experience is more on the inadequate checks side.

Though with the recent layoffs and stuff, the security in Amazon was getting better. Even the best-practices for IAM policies that was the norm in 2018, is just getting enforced by 2025.

Since I had a background of infosec, it always confused me how normal it was to give/grant overly permissive policies to basically anything. Even opening ports to worldwide (0.0.0.0/0) had just been a significant issue in 2024, still, you can easily get away with by the time the scanner finds your host/policy/configuration...

Although nearly all AWS accounts managed by Conduit (internal AWS Account Creation and Management Service), the "magic-team" had many "account-containers" to make all these child/service accounts joining into a parent "organization-account". By the time I left, the "organization-account" had no restrictive policies set, it is up to the developers to secure their resources. (like S3 buckets & their policies)

So, I don't think the policy folks are overall wrong. In the best case scenario, they do not need to exist in the first place! As the enforcement should be done to ensure security. But that always has an exception somewhere in someone's workflow.