It's called backward compatibility, and in general, if a feature is going away that many depend upon, lots of warning is given: think about the removal of support for 32 bit apps: several Mac OS versions warned us, and now in Catalina, it's finally complete desupported. Not so with the sudden desupport of XML. DJ's are not beta testers, and desupport should have been telegraphed to them as well as those who build apps for DJ's well in advance. It was not. the OP is simply incorrect and in his comment.