Most frames just state that they are sent "From server to client" while e.g. MC_SESSION_LEAVE says "from server to client
in either the unicast connection or a channel"
Either remove the specifier from everywhere or, and probably better, add it to everywhere.
I think removing it here and just using the list at the bottom as the only normative reference for what frames can be sent over which transmit options will make it easier to keep straight.
Most frames just state that they are sent "From server to client" while e.g. MC_SESSION_LEAVE says "from server to client in either the unicast connection or a channel"
Either remove the specifier from everywhere or, and probably better, add it to everywhere.