Any real use cases that we are NOT prioritise Local Files Over DNS in `nsswitch.conf`

**Background** Recently, I learned that there is a name Service Switch configuration file - nsswitch.conf in some Unix-like operating systems. We can change the domain name resolution order using nsswitch.conf. The most common order should be prioritizing Local Files over DNS. In the nsswitch.conf, it should be defined as

hosts:          files DNS

I want to know if any other use cases are NOT configured as the above? For example,

hosts:          DNS

--- **Question** What are the real use cases, and why are we **NOT** prioritising Local Files Over DNS in nsswitch.conf? **One use case is enough.**