I agree it's worth considering, but allowing problems on e.g. weekends sets up weird incentives for management everywhere I've been.

For example, they may not want to fix quality issues as long as their consequences can be pushed to the weekend. Or they may start to demand people work weekends to do maintenance.

Or -- worst of all -- they realise they can avoid deployments entirely on weekdays, and then do these big bang deployments on weekends.

This makes engineer's lives miserable but looks like rational optimisation to management.