Sorry, Getoutofmygalley, not RUBBISH at all.
It would be like upgrading a rental car to get a bigger boot and then finding that the upgraded car didn't have a heater. Saying to the customer "Well you asked for a bigger boot, you didn't specify a heater" just wouldn't wash, would it?
Of course the airline should specify at the time of purchase that the extra leg-room seats don't recline. Otherwise the Advertising Standards guys will have complaints on their hands.