Not OP, but modularity. An X11 WM is just a WM. You can choose compositor, bar, shortcut daemon, etc. With Wayland, a single implementation holds most of that, and more. If you need a specific feature from your display server, you are stuck on WMs that support it. This has forced me to use KDE for Wayland on my main workstation, and although it works well, it’s not my prefered WM/workflow.
Alongside that, no clones of several X11 WMs exist. bspwm for example. Riverwm exists, but has major limitations, and the workflow isn’t the same.
Not OP, but modularity. An X11 WM is just a WM. You can choose compositor, bar, shortcut daemon, etc. With Wayland, a single implementation holds most of that, and more. If you need a specific feature from your display server, you are stuck on WMs that support it. This has forced me to use KDE for Wayland on my main workstation, and although it works well, it’s not my prefered WM/workflow.
Alongside that, no clones of several X11 WMs exist. bspwm for example. Riverwm exists, but has major limitations, and the workflow isn’t the same.