My 2015 GT was a locate acquisition from another dealer. It had the factory fob-based remote start option for $500. Told my dealer I didn't want the option so he offered to split the cost. I've used it perhaps a dozen times over the past 3 years and still don't think it is worth it. No mobile app for the version I have so perhaps 150 foot range.
I keep my CX-5 garaged so won't ever start it while in the garage unless I'm backing out the car immediately.
My 2017 CX-5 GT definitely won't have it.