Of the two Constitutional Carry states which claim to limit Constitutional Carry to residents, North Dakota recognizes permits from 37 states.Wyoming Recognizes permits from 40 states.
Then you write:
Here is the reciprocity status for the 18 Constitutional Carry states:
Followed by a state-by-state rundown of how many other state permits that state recognized.
Presumably 16 of those 18 Constitutional Carry states allow non-residents to Constitutionally Carry within their state, so why would they need to recognize any other state's permit?
Now, there are some states that require that another state recognize their permit before they will recognize the other state's permit, but other than that what am I missing here?
As mentioned, there are some cut-outs and exceptions where having a permit makes a difference.
Also, editing error: The article says three Constitutional Carry states limit it to residents, then it says two.
It was found Idaho had changed their law from only residents to everyone, but the first sentence mentioning three states was missed in the edit.