I use a metal spatula on my cast iron all the time.

Cast iron can take a fair amount of abuse.

The method some people use to clean super stuck on bits it literally a square of chain mail. I just use salt, I don't think the chain mail works that well.

Yeah, PFAS or forever chemicals like Teflon are not all equal. The bigger "fluffier" molecules can pass through the body way easier than the smaller ones.

If people are in the US they should check their drinking water first since that's the majority of PFAS that stay in the body weirdly enough.

The pan coating itself is inert and isn't harmful. It is the precursor chemicals which bioaccumulate and cause issues.

Not sure why you are down voted, you are right. Teflon molecules are really long chains, your body doesn't interact or store it, you just shit it out as it entered. The issue is the molecules used in it's production, that are dumped in rivers and end up everywhere.