Talk Tennis Guru
Here is a slow-motion video of several Federer service returns - forehand and backhand. See how far back the racket has been taken.
I *think* what @thomas daniels means is "racquet prep" involves the unit turn, not a separate motion of takeback. It's hard to tell because he doesn't explicitly state this. But it's the only thing that makes sense to me.
Furthermore, I think he then states that only worrying about racquet prep is fine for the rec player; no need for a huge takeback.
One could use a larger takeback but that takes time and maybe we don't have enough with a fast incoming ball.
How large a takeback the pros use might be irrelevant to TD's reasoning.
Then again, since I'm on his ignore list, I can't ask him.