and, as nearly as I can determine, in all engineering. They are quite beneficial in all fields of business and can frequently aid in ordinary life decisions. Every one should be able to apply then to situations where there is some benefit.

As Sureferbeetle said:
...It’s just a tool I use to get things done, not an end in itself.
Human conflict is, like it or not, an instinctive and visceral endeavor. Proper conduct of it on an organized basis is intuitive -- and it's most emphatically an art, not a science or a business. Metrics can be somewhat useful in some instance but extremely careful selection of WHAT metrics is critical; metrics for metrics sake solve nothing and not only do not add value, they may well detract from the effort. When they become an end in themselves, they invariably will do more harm than good.

My experience with the Armed forces of the US is that we rarely got what metrics were important correct and that far too frequently, they became an end in themselves. Hopefully, everyone else here had -- more importantly, will have -- better experience with 'em.