With respect, I think it's your experience that is very unusual. I reckon you must never go camping and use a sleeping bag with a long zipper or you wouldn't say what you've said.

The woman who runs the drycleaning shop near where I live also provides a garment alteration service and her main business is shortening jeans and replacing broken zippers! She even specializes in replacing long zippers on leather jackets as they break so often.

When they're such a bane for others one has to wonder why you have so little trouble, or how careful and methodical you are when using them, and or what type you're familiar with, what garments you have them on etc.

Can you honestly say you've never had zipper teeth part company with the fabric or never had to apply candle wax or similar to the teeth so they run smoothly? If yes, then you're a very lucky person.