What is the meaning of "It does not have to be crazy at work"?

A lot of people get wrapped up into what work should look like, that being busy is what work is, and being busy is good. David Heinemeier Hansson and his team try to advocate for the calm company, that busy is not the right answer, that work does not have to be crazy. It is better when it is come, you do bette when you do not work 100 hours with unrealistic deadlines and an overflowing inbox. Weekends should be yours. You should get enough sleep...etc. 8 hours a day is enough. Time for self is important. Everything does not have to be a rush.