I never got comfortable with tiling extensions on Gnome since they always had annoying bugs (crashes, floating windows hiding behind tiled windows, not resising correctly). Sway or Hyprland work flawlessly, with tiling directly built in the compositor.
Hopefully Cosmic DE's compositor will manage to tile like sway, because then I'll seriously consider switching.
Tiling isn't a feature that I use to any degree. However, I'm really excited to see the progress you've made on the DE. I'll definitely give it a spin when it's released.