I agree that striving for (let alone expecting) perfection is fraught. But a business's goals in commissioning software development are related to but distinct

I agree that striving for (let alone expecting) perfection is fraught. But a business's goals in commissioning software development are related to but distinct from a developer's goals in delivering it. If you write software for a living in the 21st century, and you don't find a way to incorporate constant learning and improvement, and strive to refine and master your craft, then you're definitely doing it wrong.