Beside freeing the hands, the greatest advantage I can see is the increased vision over the plains grasses and brush. I guess we won't know for sure until time machines are as popular as cars.
Beside freeing the hands, the greatest advantage I can see is the increased vision over the plains grasses and brush. It seems a pretty complicated adaptation for that use. A very long neck would require much fewer genetic changes.
Here's another advantage: bipedal walking is faster and more efficient for long-distance travel. But again, partial bipedalism doesn't cut it.