The dissent shows a lack of understanding of the game. They seem to differentiate between playing area and the court. In tennis, the court is almost the playing area, and the space to the fences are not that significant, unlike say a baseball field where someone could be considered close to the batter and someone else far away. When finishing a session/match, players also exit from near the net, unlike other sports where they may exit from the nearest sideline. In such a situation, someone who starts a practice serve clearly knows that the game is over.
It is the same situation if someone hits the opponent with a ball at changeover. It is clear that the game has ended and the opponent cannot be reasonably expected to be on the lookout for aggressive shots.
Majority is correct and the dissenters should learn more about tennis and preferably quit the judicial profession since they are clearly incompetent.