It's just silicon valley startup mentality.

You literally work inside a room with no windows, poor ventilation, and sound dampening. Anyone who doesn't go home after 8 hours has something wrong with them.

The low performers are beyond low performers, the 6th decile at the federal govnerment would be the bottom decile at most larger well run private organizations. Again i am talking white collar federal government.

At the margin, in corporate america salaried professionals have a focus on deadlines and deliverables (because a. If the company goes under They’re out of a job and b. If they consistently miss deadlines they’re out of a job), so if that means the occasional late night, or an an expectation around a 10 hr work day - ok. On the federal government side the attitude CAN be “if it’s late, it’s late - what are they going to do, fire me?” Without some sense of urgency (however that is inspired) productivity is bad and tends to get worse.