I had at least z dozen zippers replaced through my life. Some times you a very good product with poorly chosen zipper, some times it is some sort of an accident.
I find the idea of buying a new coat instead of fixing a small part of the old one weird.
I'm in my 40s and don't think I've ever replaced a zipper. I'm sure a handful have broken over my lifetime, but never on something nice enough to be worth repairing. I wouldn't buy clothing based on the possibility of this (to me) extreme edge case.
I had at least z dozen zippers replaced through my life. Some times you a very good product with poorly chosen zipper, some times it is some sort of an accident.
I find the idea of buying a new coat instead of fixing a small part of the old one weird.