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As a generality, stories are about people and how their interactions with each other change them. Adding richness to your characters' journey, even if those aspects do not affect their arc, can be...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/47725 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
As a generality, stories are about people and how their interactions with each other change them. Adding richness to your characters' journey, even if those aspects do not affect their arc, can be just that: _richness_. (If you need to think of this mechanically, this can be a tool to break characters out of being one-dimensional tropes. Just take heed of the points raised by the other answers: always be mindful of how these scenes effect the pace.)