"they're a different challenge."
That they are!
And that's fine. It's that ALL of them are formidable. Some are so poor from the back court that it's serve/return/winner or outright service return. Yet when they get to the net their all world. Not all back court players are all world, why are all net players?
I just finished an hour or so of practice, setting myself and computer as Volleyer. Me 100% across the board, computer at 60. I can't come close to what the computer can do at the net.