Because empathy is important to communicating effectively. You're looking at the words, but you're not looking at phrasing and tone, which are just as important.
Try this exercise: read the sentence out loud to yourself. Taking a line out of Myers-Briggs, does it sound more perceptive or judging, to you, when read aloud?
To me it sounds judging, as if Coraline already has pre-conceived notions about the person she is communicating with. At the very least, it sounds unnecessarily defensive. The wording is definite, with no room for discussion. In fact, all I see in that wording is a mini "well, actually" lecture.
The reality is that she doesn't know if this was an intentional or unintentional oversight. People leave things out, forget to finish sentences, paint in broad strokes and fine-tune later. From the description, this likely wasn't in its final stages. Maybe it was going to get changed, or maybe it wasn't, but you need to start from the idea that the person on the other end of the sentence also wants the best results.
It's a nice idea to think that people should say whatever they want as long as it's the objective truth, but humans are humans, which means they are subjective and have feelings. I find that people are much more effective workers when they are attentive to the feelings of others.
Another phrasing which is probably just as effective, much less aggressive, and only slightly more wordy:
"Have you considered how people of different gender identities might engage with this question? Transgender people might be confused if they identify as both male (or female) and trans. Perhaps we can find a way to make this question a little less ambiguous for this class of people?"
Sure, the proposed solution is not directly in that sentence-- but that's kind of the point. You have to get on the same page before you start throwing out answers at people. Maybe the data scientist already knows this but just didn't communicate effectively-- otherwise you end up dangerously close to "well actually"ing someone who already knows the thing you're telling them.
In fact, to me, the weirdest part of the article is how ironic it is to see Coraline be so obtusely unaware of how unempathetic this kind of phrasing is, since she is so vocal about it on Twitter. It definitely strikes me as slightly hypocritical to see people arguing that we should be allowed to get straight to the point of a technical argument without any fluff or nicety. I believe this was the exact opposite argument being made from the same camp when Code of Conduct discussions were being had.
