Sometimes GPS isn't working. What if you're in an underground parking lot?
I do agree though, it seems like a bit of a fail if the OS knows that it has a good fix on GPS, you shouldn't even need a "current location". Just tap the location you want and go. If you want to do a route from A to B, then do the swipe. But I expect the difficulty there is that getting a GPS fix takes time, and mobile apps in 2012 can't do it in the background.
