if you use vim or emacs a lot like I do it's kind of a natural progression. I also absolutely hate using the track/touchpad on my laptop, I just despise it, so with this I dont' have to use it or even my mouse. I only ever use the mouse if I'm gaming. I also use qutebrowser so, again, not using the touchpad/mouse.
Once you remove the use of a touchpad/mouse you'll be surprised how much faster you can navigate around.
The reason why I worked on this is because I liked ratpoison and cagebreak but there were things I wanted that those didn't provide like the use of a launcher (since I use qutebrowser I need either rofi or dmenu for password management), notifications for emails, I like having a wallpaper, etc. and If I want to game a little bit using cagebreak wasn't practical for it.
for my dev work it does improve my workflow. It's a very niche WM and not for everyone but it's fun to work on and get experience building these things as I've never done it before.