Other than gnome I don’t see fragmentation in your argument. Most of the distros have shifted to systemd, most of them are shifting to Wayland. Immutable is a way of installation.
On these basic stuff it seems they are getting less fragmented instead of more.
Linux people have always been divided emacs vs vi; gnome vs kde. Nothings gonna stop that, chill man is fun.
Arch Linux is the best for ur future projects in the morning but I am a bit of it and send it to be employed in his thoughts.