Ahh I understand. However, they would probably be criticised for thinking the plebs weren’t worth a private photo, just a generic card. Or worse it would lead to another “where’s Kate” debacle. I honestly think they are damned if they do, damned if they don’t.
I would love a more Christmassy photo but I just don’t know how they would navigate it in a way that wasn’t tacky or highlighted their privilege whilst still being personable.