Base Retires Flashblocks Feeds, Leaving Stale Connections

The retirement of Flashblocks feeds creates a silent failure mode: connections still succeed, so integrations may not notice they are receiving no previews until pending-state reads break. This shifts the burden onto developers to audit subscriptions and migrate to Denim, a change that matters most for teams relying on low-latency block previews rather than full blocks. Whether Denim's 200-millisecond cadence preserves the responsiveness those integrations were built around is the open question, and how quickly stale connections surface in production will show how much the cutover depends on developer diligence.