I had the same concern. Symantec Tech responded that although Intelligent Updater definitions are release more frequently, the definitions in LiveUpdate are sufficient for corporate environments (Intelligent Updater defs have category 1 and 2 updates - not muc of a risk for corp. users)...
I had the same concern. Here is the response to my query from Symantec:
Per your request I will try to explain the reason why it "appears" that your definitions are out of date:
Here is a cut and paste from www.sarc.com (Symantecs security response page).
Intelligent Updater Defs...
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