[urban_winter]

Our team has thorough, high quality, automated tests. In the past 5 years we have never released such a badly broken system that emergency remedial work was required. We still don't release on Fridays. It's just common sense, risk management and (most importantly) respect for the developers home and family time.

[devjab]

I'd argue that it depends on your users. From a business perspective, it's a lot safer for us to release on fridays because failures would not affect a lot of people over the weekend. Of course I do live in a country where you'd have to agree to fix it over the weekend, and if you do, you'd be compensated with new days off + money.