Status: OUT
The WAL's carefully calibrated write-time durability tiers (per-write fsync in sync mode vs. batch-only fsync) are completely invisible to recovery: sequence numbers and checkpoints that could distinguish between definitely-durable and potentially-lost records are never consulted, so replay treats all CRC-valid records identically regardless of whether they were fsynced — the write-time investment in durability is wasted.
Write-time durability calibration is invisible to the recovery path that ignores its own infrastructure
Depends on (SL): wal-two-tier-durability-model, wal-recovery-infrastructure-is-vestigial