It is ridiculous and senseless, but not a popular view here since there are a lot of HN'ers whose salary depends on that rectangle being the OS instead of the user's actual OS. What's even more ridiculous is that we also now have software that you download and "install" onto the actual OS, but the software itself comes bundled with another copy of that rectangle plus all the machinery underneath it. Installing an OS on an OS for each application. We have gone mad.

OS vendors could have prevented this madness, but chose the path of deliberate incompatibility with each other, so we're left with the world as it is rather than as it should be.