Both Haiku and SerenityOS seem to have enough momentum to potentially become viable contenders for the Open Source Desktop someday.

Both of them highlight how much nicer a vertically integrated user experience can be as well as how much lighter weight a modern desktop can be as well. They also demonstrate that it does not take dozens of corporate paid engineers to do it ( not that I would turn them away ).

Haiku has a long lead over Serenity in terms of hardware support and now app compatibility ( with the new X11 and Wayland stuff ). That said, having to drag along binary compatibility with BeOS must really be slowing Haiku down at this point.

I am looking forward to using one or both of them in the future.