The thing to remember about metrics is that they are about measuring something, and as Deming himself noted, the most important numbers are those you can't measure.
Yes, software is used pervasively. That's a GOOD reason for not having common metrics. Even the same metric, when the measurement can be supplied, doesn't mean the same thing in different contexts. We measure speed for both cars and airplanes. But we don't expect the same speed out of a Mercedes as a 767 - or a helicopter. And airplanes have metrics that don't apply to cars, like rate-of-climb, service ceiling; likewise cars are measured for stopping distance, which differs in meaning from a landing requirement.
And it's obvious that "fast" has an almost qualitatively different meaning when applied to alligators . . . :-)
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