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You explained it in 2 lines that would make for great comments.

It seems useful to educate C programmers who don't have "significant experience" because, well, by definition, not every C programmer has "significant experience" and they are the ones who would benefit most from learning this.

It's not about being controversial: nobody's going to disagree with your explanation (it is what it is - it's not an opinion).

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I don't remember how I learned this. But it happens pretty naturally working with C a lot and doing things like reading documentation and code. To be clear this is not elitism or something of the sort, I am not at all pessimistic that new people won't learn it. It just needs to happen in its due time.

So I would say... What good is a verbose comment to explain? Somebody who doesn't instantly understand why it's banned can read the big warnings on the manpage, or they can google it and land on good explanations on sites like Stack Overflow, or they can look at the function signatures and come up with a correct guess. Then boom. They know. And from there they can assess other interfaces and see if they suffer the same weakness.

This ability tends to come from simple exposure.