> we couldn't even release new updates during a weekday

so you were forced to release updates on weekends? isn't that worse?

It depends on the schedules of the people who'll have to fix it if something goes wrong. I don't mind working weekends, so when I was in the sysadmin game I always tried to make significant changes late friday/early saturday, so if something went wrong I had the weekend to fix it & clean up. But if the people needed to fix a problem take weekends off, pretty much the opposite schedule applies.

Flights generally peak Mon-Thu due to business flights, weekends are usually lighter unless it's a long holiday weekend.

Worse for the employees. Better for the clients.