On a project, you have to hold everyone to the same level of excellence, delivery and output.
This doesn’t mean that everyone has to churn out 45 hours a week of work.
It means that the value of their work that they are churning out is comparable.
I can’t talk for what it takes to write brilliant requirements or come up with the latest and greatest test plans that will make your heart sing. I do know, that if you are putting all your efforts into making sure that developers are achieving a high-level of coding standard, you better be doing it with all your other delivery teams.
You’re not going to get that much mileage out of an engine that’s only running at 25% efficiency.