Ruby still gets you some nice perks:

-On S7,you would still get access to seat reservation including emergency exit/bulkhead even on "Hand baggage only/no seat selection fares",as well as an extra 1PCS@23KG.+the amazing priority security facility at DME+increase in op ups chance.

-On RJ ex AMM you'd be able to use the premium check in lounge with it's own security/immigration facilities+priority boarding.

-On CX,access to emergency exit seats (although I am not intrested in those).