I challenge you to create a block of ice that weighs 50 lbs. and that can still "fly like a frisbee".
Okay, 20 pounds. or 15 pounds. Or even ten pounds. Something like that hitting your windshield at 50 MPH will ruin your day, to say the least.
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As I wrote in an earlier post one of those decapitated a co-worker.
Where do YOU live? Florida? Have you ever SEEN the stuff that can come off a large truck?
I've seen, and avoided, couple-foot-square, several inch thick 'shingles' coming off of trucks and sailing a decent distance. And I've had my windshield cracked by a smaller piece.
Should it happen to you, then you would understand.