Your original text contained this line: "The above is why Pyrex cookware is likely to crack and split in microwave cooking". I've emphasized where you wrote "likely", which you can verify at https://news.ycombinator.com/item?id=36839086 .

Your Pyrex cookware is NOT likely to crack in split in microwave cooking, as I earlier stated at https://news.ycombinator.com/item?id=36839452 .

> it is hotter than ambient temperature, microwave energy has been absorbed across the large surface area.

Sure. Agreed. That's why I wrote "the glass will heat up faster than otherwise" with emphasis added to show how I know the glass will heat up no matter its composition.

Put your 1.75QT - 1.65L Pyrex cookware in the microwave, by itself, and it will also heat up. That's not a sign that there is some special additive.

You think the glass turntable contains a metal additive which absorbs energy. This means it will get hotter than glass without the additive. Where is your evidence that it is designed this way?