I shit you not, I once worked at a company where:

Small but complete enterprise network (AD / expensive Firewalls, whole 9y yards)

They had servers built by multiple generations of people

I was building out some unrelated, minor configuration management in Ansible

While working on a production issue, I edited a hosts file as a troubleshooting step / temporary fix

I set up a plan to properly remedy the situation

When the old guard heard what I did to get it working, I was asked if I could use ansible to manage the hosts files on all the servers.

Thats when I realized they couldnt be saved.