Have them but only use on a long ride. Short ride and definitely not on the course we don’t use them.
However one of our neighbor had a disabled adult, that fell out of cart sitting on the golf course. Serious issues from the fall, seatbelt would have solved that.
Can’t quote but you will see many seatbelts not used, my guess is that drove a car in their youth without why have them in a cart
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Do not worry about things you can not change 
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