And if cast iron is too heavy, then use carbon steel or stainless. We just keep a Teflon pan to cook those frozen rotis.

Don’t take this the wrong way, but this is an answer to a question OP didn’t ask. They were asking for a descriptive answer to the driving limit, not a normative opinion of what you think the limit should be.

Also your conclusion doesn’t follow from the premise. (I could be wrong; but it really doesn’t matter anyway considering the first paragraph of my response)