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Queues invert control flow but require flow control
Queues are key elements of any asynchronous system because they can invert control flow
For example, when the AWS Serverless DA team built their Serverlesspresso app, they found that their backend consisting of two baristas is easily overloaded by demand spikes for free coffee. I am firm believer in learning about architecture from real life situations, so you will find all forms of flow control in many lines, e.g., those outside a popular club (we once waited over an hour to get into the then-famous Ghost bar on top of the Palms Casino in Las vegas). GCP Pub/Sub doesn't have an explicit setting, but relies on a Slow Start Algorithm that increases delivery speed as long as the downstream system handles the load (indicated by a 99% acknowledgment rate and less than one second push request latency).
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