What protocol is missing from Wayland?
Yes Wayland doesn't have a printer protocol like Xorg, I know.
Yes Wayland doesn't have a printer protocol like Xorg, I know.
This is an incomplete list of protocols that aren't part of core Wayland. Compositors implement additional protocols that aren't even part of this process (e.g. wlr-screencopy-unstable). See the wlroota protocols here: https://gitlab.freedesktop.org/wlroots/wlroots/-/tree/master...
Just because a protocol isn't part of Wayland, doesn't mean a standard protocol does not exists.