Well the PowerPro website was done nearly 20 years ago, while the HammerSpoon one two years ago, so that's mostly where the difference comes from. Also it seems the PowerPro website makes more sense if viewed on a good old 1024x768 resolution.
This. PowerPro is an amazing tool, although somewhat esoteric. What surprises me is that successive Windows releases have not ended making the development impossible. I submitted a pair of plugins more than 10 years ago. I've been surprised to see development is still active, and for what I understand is pretty equivalent to Hammerspoon, including window management, shortcuts, menubars & desktop scripting support.
How did you come to the conclusion that one website represents an entire culture of millions of developers?