Because it's an iPhone and Apple is run by a bunch of power hungry assholes that won't play nice with other companies and choose to make everything proprietary and locked down :-D
The iPhone is not the only one that doesn't do Text Messages with Sync. Hell the iPhone actually integrates better with Sync than lots of other phones.
http://www.nsapp.fordtechservice.dealerconnection.com/sync/usEN/sync_us_EN_iop_1_30.pdf
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