I was really disappointed kdbus didn't make it into the Kernel (apparently for good reasons), as this would've solved so many issues. What I'm still trying to

I was really disappointed kdbus didn't make it into the Kernel (apparently for good reasons), as this would've solved so many issues. What I'm still trying to wrap my head around is Varlink's [1] role in all this since then. Is it supposed to make DBus obsolete at some point? What level of compatibility towards DBus does it offer? What's the driving force behind it's development? How widely was it adopted so far (I've seen at least a few usage references in systemd, such as for the user/group API [2])? [1] https://varlink.org/ https://varlink.org/ [2] https://systemd.io/USER_GROUP_API/ https://systemd.io/USER_GROUP_API/