Now that it’s 2025, maybe it’s time to take another look at those goals? It looks like most of these have at least been explored with topics here.
I can comment on this.
As of November 2024, Happy Hare (the software for pretty much every Klipper-based MMU) got a pretty big update to support Type-B MMU’s like the 3MS (my design), ERCF, Box Turtle, Night Owl, etc. It also has beta Mainsail/Fluidd integrations.