Yes, poor quality glass is the problem. It's why I insist on OEM glass for my higher end vehicles.
My old S2000 Honda was sandblasted badly so I changed the windshield with a cheap Safelite. It scratched immediately, and within short order appeared to have a film on it. Yes, it was nice to have a windshield that I could drive into the sun with. But the problem became worse in some ways, as night driving was far more difficult with that Safelite windshield.
Hyundai/Kia is well known for this.
My old S2000 Honda was sandblasted badly so I changed the windshield with a cheap Safelite. It scratched immediately, and within short order appeared to have a film on it. Yes, it was nice to have a windshield that I could drive into the sun with. But the problem became worse in some ways, as night driving was far more difficult with that Safelite windshield.
Hyundai/Kia is well known for this.