Firstly that mode is completely valid for many use cases e.g. logging, metrics. Secondly all the drivers handle this behaviour behind the scenes for you. Thirdl

Firstly that mode is completely valid for many use cases e.g. logging, metrics. Secondly all the drivers handle this behaviour behind the scenes for you. Thirdly it is trivial to set the write concern to specify how many instances of the replica set you want the write to persist to as well. And silent data corruption is an easy possibility ?