I agree with this 100%. I've been working on a piece of software for the last few weeks that does morph combination forecasting, and the combo morphs are a real PITA.
What's really bad are when there are 2-3 versions of a particular combo morph that were named differently by the producers, but are genetically indistinguishable.
I've found the bigger breeders have the contents of many of their older designer combos listed, which makes life a little easier, but without a central body defining each morph and combo, it's a crap-shoot as to whether or not you can reliably infer the contents of a particular animal given only it's combo name.