People manage to survive without planning out the number of breaths they will take every day. A competent engineering team is going to do well even without target lines of code per second goals.
So as I've said elsewhere, the problem isn't measurement. The problem is as Deming said "The aim defines the system". Well thought out measures in accordance with clear goals and aims can be valuable. Like anything though, it requires careful consideration and may need to be revised based on outcomes.