I think tools like YaST help to save time, instead of editing the bootloader in config files, you can simply enter, search for "Boot Loader" and edit there, be following a tutorial or official documentation. I sometimes prefer to use YaST just so I don't do things wrong. it's like the old Control Panel in Windows.

The real question is -- can you use the Terminal without Linux?

To all the people pointing the many inconsistencies of Linux/specific distros, I recommend The Unix Haters' Handbook

My aunt is using Linux without terminal since 2016. Though she at least knows how to open terminal and paste commands when it's necessary (needed a couple of times).

You can use Linux without a terminal, but life is so much easier to just remember few letters (command) and pressing enter instead remembering 200 places where a setting is. You can also always just do sudo pacman --help.