Aviation is a good example if you want to have zero fatal mistakes. There is a way and there is a cost to do so.
The same way erlang is good example of how to run a highly available system with hot reload and observability and stuff. There is cost for that too.
Maybe not all of the projects need the same properties. I'm fine if some of the stuff is having scheduled or unscheduled maintenance. Some kind of government portal that I use once a year had my permission to be offline between 0300 and 0500 and then again after 1200.
The same way erlang is good example of how to run a highly available system with hot reload and observability and stuff. There is cost for that too.
Maybe not all of the projects need the same properties. I'm fine if some of the stuff is having scheduled or unscheduled maintenance. Some kind of government portal that I use once a year had my permission to be offline between 0300 and 0500 and then again after 1200.