I try not to be a fanboy and I cannot respond without sounding like one here.
Basically the problem is one of thought processes and visual appeal. No two users, despite being identical twins (for instance), will think about and interact with a computer in the exact same manner. So what works for one person might not work as effectively for another. Nor do users have the same appreciation for visual style. Let alone physical abilities or limitations. So, ultimately, you come down to no two people are exactly alike.
This applies to their computer systems as well as their own person. What makes logical sense to you and is easily performed might not be as clear to me. Operating System customization, whether just eye-candy or real changes to how it functions, might make it possible for me to use my computer more effectively. Which is the whole point of having a computer, really.
Besides, Stardock has actually impacted every single person on the planet who has used the last couple of major Windows versions released. Stardock, who frequently works with Microsoft as a GUI consultant, has probably had as much to do with the appearance and functionality of Window's GUI as the Apple OS. Many of Stardock's insights are gleaned from customer comments and feedback to their own products - which enhances and extends the original OS functionality. Some of the material on Stardock, and it's skinning site Wincustomize, are meant to be big, splashy, eye-catching events. But the majority of the material provided is functional and streamlined.
And for what it's worth, I personally cannot stand Window's Explorer. When I need to perform disk operations and file management, 99.9% of that work is done through
PowerDesk Pro. I've owned it for years. One window - multiple panes. Drag and drop. File viewer. Much more.