To me: 1. If there is a direct correlation between hours worked and productivity for the team, then compensation is not relative. 2. To the degree that emails late at night is cast as toxic office politics, so are attempts to normalize the productive efforts of the coworker. 3. Pathologizing a coworker as 'workaholic' delegitmates the person and their values. It tends to provide an excuse for treating the individual…
Good luck.