If you have been following alternative operating systems for a while, there is a good change that you have herd of Hurd. It has been in development since before Linux, and yet it is still not stable. This kernel with a super cool logo is super powerful. I am going to tell you where you can get it, why you might want to check it out, and some of it’s drawbacks.
Most people are under some naieve assumption that devs could just all work on the same thing, instead of spreading efforts across many projects.
Sure we’d probably get further if we all joined hands and sang kumbayah, but it doesn’t work well in the real world. Lack of understanding, unfamiliarity with certain systems, no interest or desire, thinking the current system is a lost cause, etc. Many reasons it doesn’t work.