There's so many factors that come into play with conversion, though. And this will vary wildly between B2B, B2C, and enterprise.

I think marketers have invaded the UX space a little too hard. We should be thinking of more inventive metrics. Stuff that isn't generic content marketable acronyms for cheap blog thrills, but more deeply ingrained metrics that correlate with the problem you're solving.

Are you solving for conversions? Then sure, use conversions and call it a day.