I thought the same mate, but tbh I haven't missed them as much as I thought I would. But I only ever really have the windscreen/feet setting on. Unless its really warm then I set it to central direction and just angle the drivers one at my head, doesnt take long to either cool you down or give you ear ache. :lol:
Get some foam and jam it in where the central heater vents are, it'll confirm whether you can or can't live without them.