I don't actually see the fragmentation here.
You can move from Gnome Shell to this without having to change the software you use.
You can move from Gnome Shell to this without having to change the software you use.
The, perhaps unrealistic and naive, thinking behind this is that if these capable people combined their efforts into one desktop environment, we'd have one great Linux desktop environment, instead of several okay desktop environments.
Cosmic exists because Gnome devs have their own roadmap that many people dislike.