Huh?

Across decades, I've heard of many cardiac events from shoveling the driveway, but absolutely zero from scraping ice off a car windshield. This correlates to the vast difference in effort required by each action — scooping, lifting and moving tons of snow, vs scraping at a few ounces of ice (which is even easier if you let the car run a few minutes with the windshield defrost on).

Now, if we had car (not trucks setup for plowing) that could automatically clear the driveway, that would be a must-have feature in areas with winter climates...

Dude if scraping ice off a windshield gives you a heart attack you have way bigger problems than your car not heating up remotely. Go see a doctor.