This is a big issue for anyone who edits footage from more than one camera. They cannot use footage from this camera in a 24p timeline because 30p looks horrible in a 24p timeline, even if you convert the frame rate. 24p converts better to 30p than the other way around.
Anyway, this just looks more like Canon's habit of random withholding of features. Making your footage compatible from all of your cameras should be a no-brainer, and the only thing needed is that they offer compatible frame rates. They don't all need to offer the highest frame rates, but they should be compatible.