"Don't deploy on Friday" is a public admittance that your company either has no CI/CD pipeline, or that all your devs are retarded rhesus monkeys who only wipe their ass if the product manager wrote it as a spec.

If the saying was: "Don't port your whole API to GraphQL on a Friday", or "Don't switch from MySQL to Postgres on a Friday", I would agree.

But you should be able to do simple deploys all the time.

I deployed on Christmas & New Year's eve. I've deployed code while high on LSD, drunk-peeing 2 liters of beer against a tree after a party. I've deployed code from the hospital while my foot was being stitched up. On average, we deploy our main codebase about 194 times a week.

If you can't trust your deploys, maybe instead of posting stupid memes about not deploying on Fridays, you should fix your testing & QA procedures.

That's pretty much my today's schedule.