Serve and volley / chip and charge isn't a viable game on every point. Even low 4.0 players have decent lobs or passing shots, especially if you get someone who can moon ball well.
I don't viably see why someone would want to get to 4.5 as fast as they can, but not have the game to get better. Obviously there are some top notch 5.0+ players who serve and volley, but most of the time they do have a solid ground game to back up their net rushing tactics.
"Sadness. Darkness. Uncertainty." -JD