So I was at work and my boss went downstairs to grab something from the convenience store and asked if anyone wanted anything and I was struck by the want to rattle off an entire grocery list. Obviously when she asked if anyone wanted anything she didn't expect anyone to ask for anything and as she expected no one did. Its one of those odd little niceties we all use on a daily basis to assure ourselves and those around us that we are friendly. For some odd reason asking someone if they want anything when we leave to get something registers as more polite to us even if it is disingenuous. When I ask if anyone wants anything at the store I never have any interest in the answer because I know it will be no. if they said yes, I'd tell them to come with.
How does this relate to writing you ask? Very loosely. Meaningless niceties are a part of our daily life and our interactions with those around us are rife with them. As such you would expect them to show up in writing quite often, but they don't. Characters are almost always straight to business. When meeting with a business partner there is always some amount of pointless drivel that precedes actually getting down to business. Having this in a book can be useful in moderation. Having too much of it slows the book down and can make the reader bored or unsure what the point is. Not having any can lead to characters seeming very one dimensional or rude. Even if your character is extremely nice, a reader may see their unwillingness to engage in trivial conversation as showing they are distant or aloof. The subtler nuances of human interaction are often difficult to convey in writing, but if done well your characters will be a lot deeper and more relatable.