Conside this .. You are in the frigid winter of Alaska, just coming back from that long fishing trip, driving back home. Days are short and nights are long ... You suddenly wonder what date it is Monday or Tuesday?... Of course, you have the phone that has bluetooth and can smoothly sync with MFT, but alas, it does not have a calendar, or maybe that functionality is broken ... Unfortunately, you check your watch only to realize that it is one of those slim dials which does not have a date on it. Just time ... so is it 7 in the morning or 7 at night? Quick thinking ... what could you do ... viola! the Sync calendar to the rescue ... especially useful since its anyway dark mostly in Winter so the on-board clock becing a couple of hours off shouldn't matter.
In all honesty, I have no clue why its there. Only reason could be to remind of scheduled maintenance. Why time was spent on this and sync apps instead of a stable, fast MFT is beyond me.
-Astro