It can lead to memory overflow and application crashes.
Without proper backpressure, a Subscriber might be overwhelmed with more data than it can process, causing memory issues and potential application crashes. In a stock price tracking system, for example, failing to implement backpressure could result in a flood of price updates that exceed the processing capability of the system, leading to data loss or application failure.
Additional Notes
Why can not implementing proper backpressure become a real problem?