It's not, but when it takes up the majority of your waking life at ~60-80hrs/wk, it's not an unreasonable expectation, especially for the mental well-being of the workers. And so long as the trend continues towards longer work hours, there really doesn't seem to be much of a humane way to deal with that added stress otherwise, despite all the obvious drawbacks you mentioned.
The ideal of course, would be to shorten the workday. Unfortunately, inertia seems to be working very much against that possible solution.