Another problem is that overly focusing on metrics means that people with good instincts are brought down to the same level as those with poor instincts.
As long as metrics are increasing someone can write shit code and design a bloated product.
“Instinct” can’t be quantified and it’s such a shame that people with good track records can’t quite justify their choices quantitatively. This happens where I work constantly. The managers who get most of their projects delivered on time - I suspect because they have good intuition about effort levels - are constantly struggling to justify their higher initial estimates because the data driven people try to reduce development down to a formula.
As long as metrics are increasing someone can write shit code and design a bloated product.