Lumpy Burgertushie wrote:it is a development tool for learning how to create extensions.
Not exactly. It's not to help people learn to create extensions.
It's purpose is to make starting a new extension quicker and easier, by generating some of the basic bare bones files/directories to help get an extension you want to build off the ground and running with a little more ease.
It also helps provide necessary files that are not readily available, such as the GPL license. Travis test suite scripts. etc.
In other words, it makes the mundane task of starting an extension a lot easier, because you don't have to copy paste/rip-off other extensions, or go through the hassle of recreating the readme, composer.json, event listener, migrations, etc. every time you want to start a new project.
Just generate what you need to get started, and begin working on your new extension from there!
And the GitHub repo has downloadable releases now, which are clearly stated on the Repo Readme. It works with any version of phpBB since 3.1.4.