It's also unsustainable over the long term. Someone might be able to slog through cranking out code in a rush — most notably, creative / thoughtful work takes a big decline here, although the person crunching usually doesn't recognize it at the time — but it ends up creating silos nobody else understands, and that becomes critical when they either burn out or suffer medical issues from working too hard. If nothing else, 80 hour weeks mean your physical health is probably headed downwards.

A lot of people say they won't do that but … it inevitably happens and then they are in a bad plus, usually learn that the company won't put anywhere near as much effort into protecting them, and that unbalanced lifestyle means they don't have much else to fall back on.