It's due to behind the batsman cam. If the player was at full size, then in a large number of circumstances, it would very difficult for the player to see the bowler approaching the stumps, the ball being released and pitching.
They could have maybe added an option to not shrink the batsmen, but I guess they just didn't want to.
They could have maybe added an option to not shrink the batsmen, but I guess they just didn't want to.
