Some people are just like that. I have a friend who drives a different brand that has a similar feature, and he uses the app almost exclusively, even though getting to it and waiting for it to go through takes far longer than me using my fob. He just really likes doing it the "high tech" way and only using one gadget for everything.
Who makes an app to unlock the car when you're carrying the key? You could also run out of car charge, but youre not worried about that, both you can just look at the gauge.
My phone battery lasts all day, and the internet is rarely down; but servers on the other hand...