The games industry is a deadline-based industry. That’s why you often see terrible practices like crunch. Crunch is typically concentrated in the last few weeks of a project, and it is fundamentally a management failure. Systemic crunch makes things unsustainable. People will become stressed, burn out, and quit—and this could eventually damage the entire industry.
Great games are made by teams that strive for success. If you are both ambitious and smart, you can design a game to be sustainable. But you must be acutely aware of deadlines and accept that our sector is based on them, because you can’t really control everything else.