[cperciva]

The execution of rulesets needs to be performed synchronously and as fast as possible, since requests are blocked until they pass the permission checks; but it doesn't need any sort of replication since each request is validated independently.

Request logging can be performed asynchronously and has much more relaxed latency requirements, but data needs to be aggregated and replicated for durability.

The extremely different requirements pretty much guarantee that these will be two completely separate systems; by Conway's Law, this means two completely separate teams. In practice, logging is more aimed at business analytics and billing.

You're right that the information should be available, and there's no technical reason why it can't be made available, but there are technical reasons which influence the social reasons why it's not available.