I don't hold the same opinion. Being detached helps you to remain objective and consistent. Focusing on the process which creates the outcomes, gives you a means to improve in an objective way. That is why people have widespread religious debates about tools and methodology, but less so about outcomes. Certain tools and techniques work well and lead to better outcomes overall, they just can't be applied to all situations. Learning when to apply what technique to a given situation is what maturity and wisdom are. You gain that through failure or though guidance.

This isn't to say outcomes don't matter; but from a practitioners point of view, they matter only so much as they inform those involved on what works and what doesn't. In general, measure what you care about, but be careful because you WILL get more of what you measure and there are often unintended consequences (cobra effect).

edited for additional clarity