Linux

Ιt depends on your competence. My mom's laptop is Debian with XFCE (2 GB RAM old Chromebook converted to run Debian) and of course, she doesn't use the terminal. But then again, she doesn't even know how to open a new tab on Chrome. She just uses 1 tab at the time (which is why it's enough with 2 GB of RAM). So she's never going to see a terminal in her life, and it's going to work just fine for her, since the only thing she does on a computer is load 1 tab on Chrome, and mostly use Facebook, or youtube, or news/recipe sites that I have put on her bookmark bar. When the computer needs to be updated, I do it for her once a month or so (using the terminal).

But if you're trying to do a lot more than that, then maybe, sometimes, you will need to fix or change things using the terminal.

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

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.

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.