The option to use proportional fonts is a very rare feature in vim-like text editors (the only other way I know of is to use terminal vim in mlterm), so for people who want this the screenshot is good advertisement.

In fact, after reading you comment, I promptly startet to install it (still compiling as I type this). My use-case is creative writing: I'm very used to vim keybindings from coding, but prefer to have a variable-width fonts for writing.