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Re:Goodbye global lock – MongoDB 2.0 vs 2.2 by taligent on Wednesday May 23, 2012 @04:10PM (#4015062)
And they've indicated that in the next stable release they will have collection level locking. All moving towards sub collection locking.

It is a relatively new database and they trying to make changes in small increments to ensure they don't break anything.

Seems prudent to me.

Re:Goodbye global lock – MongoDB 2.0 vs 2.2 by tinyjoe on Wednesday May 23, 2012 @08:02PM (#4015994)
Not that new, and with that much funding they received. They're just being lazy.