Not the op but wasn’t it thought for kiosk applications, then extended to login screens, then lauded as the savior from Xorg, while causing another promising attempt to give up?
Technical side, i dont see the exact opposide extreme to Xorg (Having everything merged in the WM vs. having most in the server) as the solution, will lead to lots of maintainability issues and fragmentation. Better would have been where the Display Server has some common elements and a sane approach to modularity.