If you can't reliably release on a Friday, your delivery process is broken. Should you send customers an unsettling policy change, late on a Friday, nah, still a hard NO.

I didn't say don't have a release process good enough to release be able on Friday (obviously you want this for emergencies).

I said don't release on Friday.

No ones release process is perfect and the best time to find holes in it is when you are just ready to have the week be over so you can happy hour on a Friday.

In this case at least part of the release process that was broken was how it was communicated to users. Now they have to spend the whole weekend putting out this fire.

Why take the chance in a non emergency situation? Enjoy your weekend and do it with a fresh mind Monday morning.