It's not a matter of laziness or efficiency or whatever. The X core protocol only allows for four keyboard groups, full stop. You can't have more than four layouts without magically changing your keymap when you switch to a layout n >= 4, which is incredibly difficult.
** Changed in: control-center (Ubuntu) Sourcepackagename: control-center => x11proto-kb Status: Needs Info => Unconfirmed -- Impossible to configure more the 4 keyboard layouts https://launchpad.net/bugs/56912 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs