The terminal is the most efficient and the simplest way for a human to communicate with a computer.
The idea that the terminal is somehow more difficult to use is just conditioning from Windows and Mac. What is actually difficult is to unlearn Windows and Mac. Using the terminal is super easy and great for beginners (at least those who have not been conditioned to fear it).
Of course, there exist tasks where having a graphical interface is very helpful, even necessary. An example is graphics programs like GIMP and Inkscape. While editing photos or videos in a terminal is possible, it tends to be very inefficient. However, these are the exceptions, not the rule: for the majority of tasks, the terminal is the more efficient interface and almost always easier to master.
When I was five years old, I couldn’t speak a word of English and I barely knew how to read and write in my native language, yet I used MS-DOS fairly comfortably. The Linux shell is much easier to use than MS-DOS. So I always find it ridiculous when people complain about terminal being difficult to learn. It really isn’t. It’s a completely irrational fear, a consequence of conditioning by Microsoft and Apple.