The linked article is literally a multi-step process of arcane terminal commands that differ by operating system. You may think it's easy, but it's definitionally not trivial.
Multistep is fair, though for the record "multi" in this case means 2. One of those steps (the only thing that differs by OS) is installing git- I think you'd agree that gatekeeping by ability to install git is pretty reasonable for a project that uses git. Using git send-email doesn't require much more configuration than configuring ssh keys to push to GitHub. The fact is, most open source development workflows outside the safe confines of java on intellij will rely on the ability to use a few commands. We're better off making more great documentation like this to help new people adjust than deliberately clipping their wings.
