Not the single dimension but an important one. Any real time application processing events data (IoT, heartbeats, prices logs) would have a similar requirement. That's one reason why people uses queues, to try to workaround this. And as for the reads, it will drilldown to your query needs. I have done systems where the read requirement was a retrieval from a key and the writes request came in thousands per second.
Absolutely, I have run data ingestion pipelines before for event data processing, perfectly suitable for the use cases you mentioned too. I just dont see mongodb as a good fit here.
