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The point of not deploying on friday is to reduce the risk of getting paged over the weekend. It's a quality of life move for the oncall team. No deployment strategy will change the fact that deployments are the leading cause of outages.

If you can't afford to give up 1/5 of your available deployment days you have a problem somewhere in your CI/CD system.

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Sure but ideally you have high enough confidence in your software that those types of issues are highly unlikely.

Over a long enough time, with enough deployments, unlikely things are guaranteed to happen! In the long run, setting a given feature loose on Monday instead of Friday is unlikely to move the needle in terms of business results, and eliminates a category of risk. I'm not superstitious about much, but No Friday Deployments is one of my rules

I agree. We have some advocates that really want to say we deploy on Friday, but even they don’t seem super pushy about a Friday deployment when they have weekend plans, and the org as a whole isn’t keen either. It’s high risk and low reward. I’ve also burned myself on this more than once.

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