I think their current modified gnome is the best desktop that exists anywhere. Cosmic is a full desktop environment with an actual (auto) tiling window manager… a combo I think should be more common in desktops. The way they implement the tiling makes it really easy for beginners to use because you can turn it on/off by keyboard shortcut or clicking the plugin icon, and because you can just drag n drop windows to change their tiled positions (along with keyboard shortcuts if preferred). It’s hard to go back regular “window managers”.
The System76 devs have good ideas, they seem really cool, and sane! They have been a net positive for the Linux community and desktop development IMO. I am SO hyped for the new Cosmic DE!