The disadvantages with this type of approach are that you can get off base. Hence, something more dynamic, with feedback (in the form of a Socratic dialogue, etc.) can be much more useful. Perhaps the Internet has the potential for being more Socratic -- was my point before. But only if we understand exactly how it fits -- how, arguably, we've been waiting for this, in our linearity, for a long time. But if we abuse its dynamic qualities, we might totally lose it. So Nick Carr by reminding us that we might think about these things -- is useful.
The advantages of the linear approach are that by dwelling with something in an engaged manner -- you can often extract value that otherwise superficial readings don't. At some point all ideas come into contact with each other, and are validated, etc. But arguably by giving people more space to develop their ideas -- sort of mentioned in this article:
http://www.nytimes.com/2010/08/16/technology/16brain.html
-- you extract more value.