Because there are many ways to be a developer, and it depends on your role and your product to say what is the most effective. Sometimes "10x" is a matter of fit.
Consider an engineer who is dedicated to performance. In the wrong organization, this kind of person can be harmful or neutral. However, if the same person at Twitter in the "fail whale" era, they may be a key contributor to keeping the organization afloat until more substantive changes take effect.
In a B2C company, product engineers are more evident. At a B2B in a sector that isn't self-evident, the same product engineer may not have the domain expertise to contribute in the same way.
It is one aptitude that many effective engineers have, though.
Consider an engineer who is dedicated to performance. In the wrong organization, this kind of person can be harmful or neutral. However, if the same person at Twitter in the "fail whale" era, they may be a key contributor to keeping the organization afloat until more substantive changes take effect.
In a B2C company, product engineers are more evident. At a B2B in a sector that isn't self-evident, the same product engineer may not have the domain expertise to contribute in the same way.
It is one aptitude that many effective engineers have, though.