Its an ancient rule that was developed to prevent choppers from taking hours to complete matches. If you have an alternative do share but it clearly has a legitimate purpose. Many things that are important can be irritating and some get less irritating when you get slightly more used to them. In this case because one of the games had leas than 18 points (17 to be exact at 10-7) played in 10 minutes of TT point play, the rule was triggered.
More like keep the tournament running on time and avoid the stress of an abnormally long match on everyone (defenders are consistentl enough to play for hours with pushes). The last Harimoto Hashimoto match had it at the very end. It is usually more common when defenders are playing each other, both men and women at the same level, because they chop to each other for long rallies. But very often if both the attacker and the defender are consistent, it can happen if they both don't want to take risk as long points are not unusual when people shift sporadically between pushing and looping, though choppers may chop to each other for a long time to go to expedite (they could just have told the umpire and agreed to start that way instead).
