Examples off the top of my head:
- Almost everything about TCP/IP stack
- NETCONF
- YAML
- Most things related to cars and car infrastructure
- Alcohol
- Chiclet keyboards
- Unicode Han unification
- Layer 2 SDN
- Kubernetes
- JavaScript
- Disk partitioning
- UEFI
- Public transit fares
Edit: checked the link and was surprised our lists didn't have any ones in common (though I considered including MS Excel).
Personally I think it's fine to have implicit defaults if you can make them sensible. Maybe ideally have a system-wide config like
/etc/someapp.conf
with all the options included and set to defaults out of the box and then allow overrides in~/.config/someapp/someapp.conf
where you only need to specify whatever you want to differ from the system conf file.