CX happens to be pretty nice about letting other OW status get the CX-specific benefits. You might be able to get the extra luggage allowance even though it isn't an entitlement. If this is important to you AA Plat is worthless because it gives the least extra luggage allowance, while QF Gold gives a lot more. I suppose you got AA Plat because it was so easy to get, but would have been better off with QF Gold instead. I rarely need extra luggage, but when I do I've planned my trip around that fact (CX is very generous with F allowance, for example). I suppose * may be better for some in this respect (though it has a lower total amount, so from my standpoint it is worse than Oneworld).