Lack of context limits most exchanges to a set of simple questions and answers.
Not exact matches
It unavoidably
lacks the multiplicity
of sources that will become available to the historian, and the events are so recent that the author is
limited in his ability to place them within a broader historical
context.
But the
lack of demographic adjustments in the published data that can ensure apples to apples comparison among states
limit its value as a tool for determining which states perform more or less well than other states or as a means
of analyzing performance in the
context of differing state education policies.
This (and the full paragraph) gets at the heart
of why private correspondence between scientists is inherently
of limited value, and also why it's a boon for political hacks (
context that is
lacking can be created to suit one's goals).