It's interesting to me that you think that my comment is at odds with what you're saying, because even re-reading it I'm not sure where you got anything about "

It's interesting to me that you think that my comment is at odds with what you're saying, because even re-reading it I'm not sure where you got anything about "metrics" from what I said. Yes, I said that the issue did happen to be performance, but only because that's what happened to be where the customer's pain was. My point was that the idea of a feature being "enough" or "not enough" doesn't really make sense outside of the context of how people are actually experiencing the product. What's weird to me about the claim "performance is not enough" (and your longer-winded quote at the end) is the idea that the idea of trying to look at what customers are actually doing and finding what their pain points are is somehow best stated by decrying performance as a metric rather than decrying _any_ single factor as "enough". If I go to a restaurant, order spaghetti, and then get sauce spilled on my lap by the server, the takeaway isn't "having high quality sauce is not enough", it's "spilling things on customers makes for a bad restaurant experience".