Honest curiosity, but in what situations do you use it? I'm having a hard time imaging a scenario where I'd want to remotely lock or unlock my car, nevermind starting the engine when it's out of sight
Skiing is the most common case for me. On my last run, I'll typically get the car going while I'm on the lift. That means it's ready to drive (not just pre-hot) when I get my ski gear put away.
I think my wife uses it sometimes at work. She's on the far end of the building from her vehicle, so out of range of the fob.