Software is definitely at the top of the list in terms of reasons. But the UX/UI definitely leaves something to be desired. I sigh heavily every time an application asks me to edit a text-based config file instead of giving me a GUI. It's an unnecessary, error-prone process and most importantly I have better things to do than read yet another page of documentation. That doesn't mean I want the config file to go away, it's still very useful for a variety of reasons. But I shouldn't have to mess around with it just to remap keys or other common tasks. Editing a config file should be a last resort for an end user.
You see similar problems when relying on the terminal. I don't like this idea of the end user being allowed to mess around without a safety net or some sort of guidance.