Dbus is a really funny POS (piece of software) because it's like a superglue for everything, infested with security holes like a dying rat with fleas. It also brings a hard dependency on systemd and makes everything harder to port to *BSD.

Anytime they (whoever is in charge of Linux Desktop) fail to implement something important, they just sweep it under dbus and pretend there is no elephant in the room. Said elephant is standing right there and drinking their toilet water.

Needless to say, Wayland is heavily tied to dbus and can barely work without it, because every mechanism that Wayland devs "envisioned" but ultimately failed (or didn't even bother) to implement was swept under dbus. Screensharing, audio, pipewire, bluetooth, network manager, notifications, portals all go through dbus. That exact dying rat infested with fleas carrying bubonic plague.