Originally Posted by Rjtennis
I thought the same...that's crazy!
Yep, it's crazy but true.
The rule used to say that taking a bathroom break during the last 15 minutes of a timed match was an automatic default.
This was deemed too harsh (and honestly, it is IMHO because many people have issues that mean they simply must use the bathroom when they must use it). So now the rule says the break can be taken and it "encourages" the opponent to accompany the player.
You don't have to go and watch them tinkle, but you can if you want. I suppose the real reason for the suggestion is to discourage anyone from doing anything else besides taking a bathroom break.