Creating a wayland compositor based in wlroots is much more work than an X11 window manager. And then there's quite a bit of work to keep up with new Wayland protocols.

But I personally don't think there's a need for more compositors, since the existing compositors do support all kinds of tiling.

E.g. river has custom layout providers, which allows for creating completely custom tiling behaviour. There's even a hyprland plugin which implements river-layout-v3.