Plus I've observed that people who consistently do a lot of overtime for prolonged periods of time rarely seem stop and think, and are fairly consistently some of the worst programmers I've had to work with. They're not necessarily stupid or lacking in skill – often the opposite actually, they just never stop long enough for their brain to actually process things, so questions like "hey, is this actually a good idea?" or "how can this be done better?" just don't seem to percolate; your brain just needs some "downtime" for that.