Sure that takes a lot of time but why would the car be out of fob range? If you care about 15 minutes of scraping snow why is the car parked out of fob range and also still in cell service somehow?
People hating having to scrape their car in the morning doesn't help them getting a parking spot closer to their work place or their home.
If they had a garage next to their house to park their car they wouldn't need either. However there are lots of situations where the car isn't close yet it need pre heating. For me this is driving the car to and from work in the winter, and certain one off situations (going home from the hospital, picking up the car after avriving at the train station).
I live in an apartment building on the side that faces the woods. I obviously have to park on the other side, and my fob doesn't reach. I don't care about remote start anyways, but there are absolutely situations where fobs can't reach but cell service can.