Easy. Just learn to use it and it is already there.
With nano, you work with that letter where your cursor is at the moment. This is convenient, but limited.
With vim, you can also work with a word, or the whole line, or part of the line, or a section, or the whole file (or many files if you use the shell extension) and it goes all with the same ease.
Vim also allows you to keep your hands in place on the letters on your keyboard all the time. No need to move the hands around, grabbing the mouse and back, or the arrow keys, and thus search for the correct position for your hand every few seconds - which costs time and focus.