@EggSalad
By "early prep", it's primarily about avoiding a late racquet prep. Too many players wait for the ball to bounce before they initiate their unit turn/racquet prep. If they do the same in mini-tennis, they tend to be very
rushed and end up bunting the ball, slicing the ball or hitting the ball too fast and way past the service line (especially if they try to impart topspin). This is becuz the ball is often bouncing 3 meters in front of them or closer in short court tennis.
Sure the takeback will normally be more compact but most decent players will incorporate, at least, a moderate loop to facilitate topspin. Only on balls that bounce close to their feet will they abandon the loop swing.
On a full court rally, the round trip for the ball is typically 1.5 to 2 seconds. For a short court rally, it's not much more than this. Nominally, 2 seconds? Even tho players are hitting the ball slower (but with decent spin) for mini tennis, the ball is traveling only about half the distance. Air drag has less effect on the initial ball speed cuz the ball is traveling only half the distance or less. Player will have less ball travel to read ball trajectory & depth. So they need to stay relaxed but be diligent about turning & prepping.
Players need to prepare fairly early in order to hit the ball slower / shorter. For a given incoming ball speed, a player’s forward swing would need to start a bit sooner for a slower swing.
With an early prep, players have more options. They can swing slow, medium or fast. They can hit the ball with topspin, underspin or fairly flat. They can hit the ball straight or hit it x-court. With a late prep, players are often rushed and find that their options are much more limited.