@drmboss :
That doesn't mean that closed positions are drawish because they're closed, but that some engines don't evaluate closed positions that well.
Simply put, the concept of "an effective fortress" is alien to some software, as if the engine has more material, mobility, or space, and doesn't see any real threats from the rival, assumes there will be a way to convert the "advantage".
Being open minded to a possibility is not the same as saying it must be so.