I come home from a business meeting. I only have a few minutes and need to go back out. I took down contact info during that meeting. The computer is upstairs, the USB cable is god knows where.
I hit sync on the phone as soon as it sees the wireless, the contact info is synced back and saved to my computer in case anything happens to the phone.
There is your dumb scenario. There are many other instances in which this is useful, you don't need particular scenarios.
And again, because JAT doesn't like it or see any pros, nobody should! JAT is always right, he's like a Steve Jr.
Get over yourself.