"KPI" is a common term that most people are aware of, so it's mostly about avoiding confusion.
It reminds me strongly of MVP - people that "get it" love it (I'm among them), and it changes the way that they think of things. However, it's buzz-word-y, and alienates those who don't. My point isn't that KPIs are a bad thing (or even a bad term), but there's an important subset of people who stop listening when you say it.