Clearly you love to 'paint it so'.. the reality is that people adhere to, and are fond of their familiar traditions, and that applies to you, as much as it does to me and other members of the Church of England. And there is NOTHING wrong with that..
But they aren't foregoing that. They will have elements of that as well, but they will include other tradition as well. It can be inclusive of both, but there is some sense, based on the cake reaction, that there is a group that just doesn't want to include any things that aren't.