I watched the “inventing the alphabet” documentary. There was a guy in the video that made an excellent point that I never thought of before: letters are very simple. Looking at the letters that constitute our alphabet, and almost any alphabet, they are very easy to write and are not very intricate.  He made the point that this is because of when early humans had to carve letters into clay, there was not a lot of room for precision because of the writing tools available, so the letters became easy to draw. I think it is interesting how even with the computer and more precise writing utensils, the simplicity of the letters of our alphabet is the same today as it has been for thousands of years.