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> RethinkDB writes your data to disk before acknowledging the write

This is the default, but also note that durability is configurable on an operation-by-operation basis.

http://rethinkdb.com/docs/troubleshooting/#my-insert-queries...

Which is also my point, both mongodb and rethinkdb has the same feature in this regards but different defaults. Does that makes one worse than the other one?

Yes, because lots of people end up using software with default values. Can you blame them? Perhaps... in a way that you can blame a user who accidentally clicks a "delete account" button that doesn't have a confirmation step.

Good defaults are expected in quality software, and are just as important as any other part of software interface, CLI or GUI.

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