Data doesn't exist in a vacuum.
It exists in context.
Working with data is as much an exercise in communication as it is an exercise in applying your technical skills.
The data we work with does not exist in a vacuum. It is being interpreted by human beings, and human beings are inherently irrational. We are affected by biases and emotions.
Data is a proxy for the truth, not truth itself. We use data to try to smooth over how complex and contextual real problems are, but that means we inevitably don't get the full picture. If someone can't tell me what they don't know and can't articulate the limits of the data, I'm not going to trust what they say they do know.
Nothing matters more than the last mile between data and human beings. I've seen millions of dollars spent on incredible analysis that never gets used because someone didn't consider how to communicate with their audience. You need to understand the people using the data first.
That isn't a nice-to-have. It is the bare minimum.