By now, the documentation should have been updated in my mind as they are on version 4.1.1 (https://github.com/webpack/webpack/releases/latest).

Because I was just trying it out? Are you saying it's wrong to test a beta and provide feedback to the authors?

Sure, that's perfectly fine. I interpreted your original post as a public warning or complaint to other users. You've updated the Gist since then with a big disclaimer, so perhaps I wasn't the only one.

More broadly, I often see developers stay on the cutting edge when they don't have a security or feature need to, then complain about it.

I'm curious. How will we know when documentation has caught up?

Webpack 5 will be released.