> But isn't that risk the same for other formatting parameters?

I think that the risk for other formatting parameters is smaller, because you know, that there are different formatting parameters for different integer and floating point types, and for pointers, and you know that you should care about truncation and overflow if the type of the argument is different from the type of the parameter.

But I am not in strict opposition against this feature. It is just that I have fixed so many bugs, that I try to search potential flaws and drawbacks in any new feature. Now you know about this, and you can decide whether the benefit is larger than the risk of potential damages. To me they look equally small.

Technically PR 28634 LGTM.