Companies have deadlines, sure, but that doesn't mean they need to
routinely require overtime.
I mean, if all my recent projects required 10% overtime, I've got a bunch of options for my next project:
a. Hire 10% more staff
b. Increase my existing staff's efficiency by 10%
c. Reduce scheduling and rework inefficiencies by 10%
d. Quote 10% longer delivery times to customers
e. Promise customers 10% less
f. Start work 10% earlier.
g. Plan to make my employees work 10% overtime.
If my company was choosing option g every time, I'd expect my employees to quit for better jobs because planned overtime is a pretty big 'fuck you' from your employer.
Why employees in the games industry put up with this sort of thing is frankly beyond me.