Well, it's cultural evolution of the game. Umpires have long been too lenient in granting batter requests for "Time", and now they can't seem to get the genie back into the bottle, or the batter back into the box.

From MLB Rules

 Quote:
(EXCERPTED)

6.00—The Batter

Rule 6.02(b) Comment: The batter leaves the batter’s box at the risk of having a strike delivered and called, unless he requests the umpire to call “Time.” The batter is not at liberty to step in and out of the batter’s box at will.

Once a batter has taken his position in the batter’s box, he shall not be permitted to step out of the batter’s box in order to use the resin or the pine tar rag, unless there is a delay in the game action or, in the judgment of the umpires, weather conditions warrant an exception.

Umpires will not call “Time” at the request of the batter or any member of his team once the pitcher has started his windup or has come to a set position even though the batter claims “dust in his eyes,” “steamed glasses,” “didn’t get the sign” or for any other cause.

Umpires may grant a hitter’s request for “Time” once he is in the batter’s box, but the umpire should eliminate hitters walking out of the batter’s box without reason. If umpires are not lenient, batters will understand that they are in the batter’s box and they must remain there until the ball is pitched. See Rule 6.02(d).

8.00—The Pitcher

8.04 When the bases are unoccupied, the pitcher shall deliver the ball to the batter within 12 seconds after he receives the ball. Each time the pitcher delays the game by violating this rule, the umpire shall call “Ball.”

The 12-second timing starts when the pitcher is in possession of the ball and the batter is in the box, alert to the pitcher. The timing stops when the pitcher releases the ball.

The intent of this rule is to avoid unnecessary delays. The umpire shall insist that the catcher return the ball promptly to the pitcher, and that the pitcher take his position on the rubber promptly. Obvious delay by the pitcher should instantly be penalized by the umpire.



I'd like to see the umpires actually "do their jobs", but I don't think the players would like it much.

bibere usque ad hilaritatem