Yes, I know... A lot of people want their menus customized to fit their distro. But some don't, and they should be able to remove the custom menus items that vex them. I'm fine with archlinux-menus being in the 'gnome' group, but packages like gnome-menus and control-center should not depend on it!
Yeah, I'm not a big fan of distro specific menu entries either, so I end up having to disable them. On the other hand, as long as they can be disabled, they don't bother me all that much.
just remove it with no deps....
pacman -Rd arch-menus
If you don't like the archlinux menu, just pacman -Rd the archlinux-menus package, it's gone from KDE and every XDG compliant menu system then also.
Other option: rightclick panel -> edit menus -> uncheck the archlinux menu.