One major advantage of the CLI is that instructions/fixes etc are very concise and can be easily communicated. If someone has a Linux system that needs a known fix, then it's trivial to send someone the commands to copy/paste into a terminal. However, if there's a known fix for a graphical program, then it suddenly becomes much harder to communicate - do you go for a textual instruction (e.g. click on the hamburger menu, then choose "preferences"...), or a series of screenshots along with some text?
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