Only insofar as ensuring that the software doesn't crash in production, or otherwise cause an event that would cause on-call to be paged. If the customer has a bug, and an issue is opened in the bug tracker, what does the developer care? Forty hours a week is forty hours a week. The developer isn't responsible for delivering business features on-time, and middle management can't be held responsible for delays that are "inevitable" and "outside their control".