“What of the 14th is badly worded?”
Easy “shall not be questioned.” That is a phrase that is ill used there.
Proof can be seen as the same phrase is in Article I with an entirely different meaning.
In the 14th it is a concept not found in prior law, with no clear meaning, and opens a vast possibility of misuse.
Privileges or immunities, due process of law, equal protection of the laws are terms of art that serve as shorthand for legal concepts developed during the crafting and debates of the 14th.
It isn’t that important that you and I thoroughly understand them.
However, it is criminal when federal judges don’t know their meaning and substitute the actual meanings with their social justice whims.