Yes, you can use a lot of other editors without a mouse. The advantage of learning vim/vim mode is that you can be proficient with them without having to learn their editing keybindings. Vim mode acts as a common interface. I even use those keybindings in Chrome with cVim.

This is also not exclusive to Vim. I don't use any plugins and I have a lot of common key bindings (especially for text editing) I can use on every text editor field on my Mac (which are pretty similar on Windows). Heck I even have Emacs keybindings on OS level on macOS nearly everywhere (without installing plugins): http://jblevins.org/log/kbd

So Vim is an addition where as my key bindings work everywhere except when I go to the console where I had to learn some nano specific key bindings but which match a lot with the basic text editing keybindings from Emacs mentioned above.