RJ Spagnols directions say to let the wine sit in the primary for 14 days before racking.  There's so much CO2 happening at that point that it's difficult to have this gas depleted.  The wine kit manufacturers want above all else customers who have success, as these customers will purchase more kits and potentially the same exact ones looking for consistency.  Also, given that certain 'your kit will be done in x week' claims and each manufacturer has their own preferential process for end-user prodution, you'll see some variety. 

IMO there is a fine line where it should be racked. Racking to early will usually get you into trouble with over activity for your lesser volume vessel(carboy) to handle resulting in airlock blow off or your airlock getting clogged and spraying all over your ceiling. Racking right when it settles down could leave too much viable yeast resulting in fermentation possibly not going as dry as you would like so what I like to do is stir it up a little before racking or ferment to dry in bucket and just put the airlock on at around 1.020.