I see this written over and over again with admonitions of not to do xyz if it does not advance the plot. Yet, most books I read are full of side scenes (for lack of a better explanation) that don't advance anything other than toning down the intensity for a while. I personally appreciate the diversion in books that are full of climaxes as though they are in a non stop whirlwind of traumatic experiences. It helps me connect with the characters on a "normal" level. Getting up and using a chamber pot is in no way detrimental to the story, unless the character has dysentery and yet literature is full of the mundane tasks of characters and those tasks are repeated quite often. So explain what we are meaning when we use this phrase, since I'm at a loss at how something I write may not be appropriate for my text.