For example what language is Nginx's config written in:https://www.digitalocean.com/community/tutorials/understanding-the-nginx-configuration-file-structure-and-configuration-contexts
A lot of web servers, IRC bouncer, FTP server, etc. comes with their own configuration format, it doesn't create much problems. Very often these formats are nicer than plain JSON.
Learning SDLang being a chore is a bit overblown really.
