The problem that we are all trying to address is the glare on the inside of the windshield.

It is correct - all windshields pit over time.

However, the pitting in itself doesn't affect vision as badly as what gets INSIDE the pits.

Because of water conditions or environmental conditions, what settles inside the pits tends to be such a different material that it causes enormous light refraction as it enters the windshield.

What BJSC and others have been trying to do is to remove the material inside the pits (by the way, the diamondite system BJSC uses is essentially paint cleaning clay).

Removing the material inside the pits will actually help.

Now the glass will never be as clear as a new windshield, but it will help.

In addition, not all replacement glass is the same as the original. Differences in thickness, differences in optical clarity is VERY frequent as replacement glass (even if made by the same manufacturer as your original). In addition, I can understand why some people want to resist replacing windshields. Most shops today are just awful in installation and end up with creaking noises or worse yet, leaks.