Randy Silver in The Myth of Velocity:

When we measure how quickly teams ship stories & code, we’re measuring speed—how quickly they move. It’s only when we measure the effect it has on the target metric—the value that we’re after—that we’re actually looking at velocity.

It doesn’t matter how much you ship if the end result doesn’t deliver value to your customers and your company. If you’re measuring story points, you’ve fallen into the trap of measuring outputs, not outcomes. When we talk about slowing down to speed up, this is the point: the only thing that matters in this equation is how quickly we can deliver actual value. Everything else is theater.