David knows what he is talking about, they use MongoDB in really high scale. Also, getting database level locking was like 90% of the work according to the CEO. Doing collection and finally document level locking should be somewhat trivial now. 10Gen just want's to take it slow, and make sure database level locking is working 100% correct before moving onto more granular locking.
Yep they sure are taking it nice and slow... at this pace, collection-level locking is probably only 2 more years away. Other nosql databases are nipping at their heels.
David may use MongoDB at really high scale, but since when is that a reason to call someone an expert.
