You have to factor in the usual lifespan of glass as compared to this. A clean glass pane will resist water and ice for hundreds of years. This stuff will need to be repainted every few months to keep integrity.

I honestly do not understand why I m getting downvoted here. Am I saying anything untrue? Or did I only find a flaw which is not mentioned here?

Imagine leaving a house unattended in a humid or rainy area for one year, you would come back to swollen up windows which I am sure are far from clear. I guess you would have to replace these windows at least 5-10 times as often as regular glass. Also, glass is 100% recyclable whereas this would produce even more plastic waste.

It sounds like they’re comparing it to single pane glass, which is not what most windows are made of these days when thermal efficiency is a concern.

Well it's one to one, it's a single pane of this stuff to a single pane of traditional glass. Nothing says you can only use a single pane of this new material.

Someone mentioned that this isn't weatherproof, but it could still be used for the inside plies of a triple glazed window for instance.