I find it ironic that the RC's are weighing in disapprovingly. I know many members of their church who, because of the " it counts " mentality of the Saturday evening mass, have not been up and out on a Sunday morning in years. I think that the Christian churches should be open on Christams, but I think the RC's ought to hold their fire.
Apples and oranges. Individual Catholics may avail themselves strictly of the Saturday evening services. The Church itself does not only hold such services. If a Catholic Church held only a Christmas Eve Mass and none during the day on Christmas, that would be analogous. That isn't the case.
SD