

Your problem is that you’re starting from the wrong premise: the primary goal of most people working on Linux is not to make more people switch to it, strange as that may sound, it’s to create an operating system that they personally want to use. Which can mean a lot of different things, depending on the person. So it’s inevitable that there are a lot of different distros, and the only reason there aren’t even more is that most of the one-man shows that don’t attract many users peter out and vanish after a few months or years.
Eh, it’s Ubuntu. They have a long history of trying to reinvent the wheel, getting no traction, and then reverting to whatever the rest of the world uses instead. And Linux is full of incompatible parallel packages that provide the same functionality. It ended up not mattering very much with init systems—why should this be any different, even if it’s the one Ubuntu oval-shaped wheel that catches on for some reason?