But let's just say theoretically, that on the day of your flight, that aircraft snagged, and CX decided to put you on another aircraft with no flat seats. What then? CX fulfilled their obligation and contract in taking you from A to B.. though of course having a flat seat is one of the perks of flying CX, but flat seat or not, the fare is exactly the same.
But in this case, all the seats on that plane were working perfectly well except one. (aren't they?!?)