Strictly following MISRA like guidelines while developing web SaaS? Spending day on orchestrating mocks of this and that service so you can test some trivial class and tick the 100% code coverage box?
I think that code quality of individual methods does not matter as much as quality of overall architecture and that requires some design planning and regular refactoring and that I would imagine can hold you back from delivering something in a tight time frame. It does pay in longer term, I am not debating that, but before it pays off it may be too late.