I agree. Unless the downstream data is going to be used to feed a system to make automated decisions (ex. HFT or Ad buying), having real time analytics is usual

I agree. Unless the downstream data is going to be used to feed a system to make automated decisions (ex. HFT or Ad buying), having real time analytics is usually never worth the cost. It's almost always easier and more robust to have high tail latencies for humans to consume and as computers get faster and faster that tail latency decreases. Systems that needed complex streaming architectures in 2015 could probably be handled today with fast disk and large postgres instance (or BigQuery).