The reason Ford got rid of it probably wouldn't surprise me. Cost savings, battery savings, etc. What surprises me is how much it gets brought up on the forums. Not just this one, it gets mentioned a lot over on the F150Forum. People blow that out of proportion.
Don't get me wrong, I'm not a fan of many cost cutting aspects of these trucks. I hate the fact we need a third party latch for the driver's side seat to fold down easily. I don't like that the rear head rests don't fold down anymore. Ford stopped including the box link plates on a lot of trucks (even the 401a Tremor doesn't get them), I'd rather have real leather instead of this ActiveX pleather crap, and so on.
I'm aware of the key fob thing as I've had other F-150's that had it. I just don't think its a big deal.