Mobile hotspot or cellular modem can't be hard to install...How would any of this work without an on-board modem? If the Slate doesn't have internet connectivity then how would this function?
I think one thing to keep in mind is that "simple" and "minimalism" are not just about what the consumer buys, it is also about the focus of engineering resources.I prefer minimal but practical features for this. I say let the guy who wants a fob have a fob. If i want wireless entry and remote entry then let me buy that and install it!