I work with embedded devices, and to some degree also servers. Graphical user interfaces are usually ignored as they just take up space and resources, and you can’t even do half of what you can in the terminal (assuming you know your way around a terminal, but being a server admin, you really should).

Web interfaces are usually used for status pages, or if anyone who isn’t you or a fellow admin needs to to anything as, you guessed it, they are very restrictive, so the other party hopefully can’t do much damage.