The last point you made was exactly the problem when I attempted an experiment to migrate a heavy-IO MongoDB workload to DocumentDB - the latter imploded like a

The last point you made was exactly the problem when I attempted an experiment to migrate a heavy-IO MongoDB workload to DocumentDB - the latter imploded like a dying star after flipping the switch (under the hood it seems to be running a postgres/aurora-like storage layer). Implementation details matter, wiredtiger being one of the largest details.