> Why is that the "best" way?

"Best way" is often contextual and subjective. In this context (boolean flags to a function), this way is short, readable and scoped, even in C which doesn't even have scoped namespaces.

Maybe there are better ways, and maybe you have a different "best way", but then someone can legitimately ask you about your "best way": `Why is that the "best" way?`

The only objective truth that one can say about a particular way to do something is "This is not the worst way".