Earlier quoted context omitted.
Mouse takes far longer than a second for a selection. Switching between keyboard and mouse already takes longer than typing the usual vim-commands for a simple action. And casual keyboard-commands just don't scale well. Moving cursor x chars means you must type the movement-key x times. With vi you just type the number x and the movement, and usually save big time. Aditionally, vi has more knowledge about textual obj…
I have exclusively used vim keys for years now, but even after that time I find some of this just doesn’t ring true. Anything in vi that involves counting some number is usually faster with normal keys or the mouse. For example moving down 20 lines is way faster with the mouse, you just click. With vi you have to count the lines in your head - better hope you don’t lose count half way because two lines blur together.…
Correction - you must move your mouse hand from the keyboard, move the mouse to the desired location, _then_ click.
Ergonomic concern often goes side-by-side with editors like vim.
I'm also not convinced that comparing the simple editor things is demonstrating the value of vim much. It's how easy vim handles the _not_ simple things, and also how easy it is to motion the often unique or rarely used edits, combined with drop-of-the hat programmability, that makes vim a good choice.