Individual states recognize other state drivers licenses because they choose to, not because the federal government tells them they must. If the federal government has the power to mandate that every state respect another state's concealed carry permits then what's to stop the federal government from telling what is needed to qualify for that concealed carry permit to begin with? It is far safer and less risky to leave reciprocity at the state level where it belongs.
"Individual states recognize other state drivers licenses because they choose to, not because the federal government tells them they must."
Please clarify your statement about the states having the choice to not recognize out-of-state driver’s licenses in the context of the Constitution’s Article IV, Section 1.
"Article IV, Section 1: Full Faith and Credit shall be given in each State to the public Acts, Records, and judicial Proceedings of every other State [emphasis added]. And the Congress may by general Laws prescribe the Manner in which such Acts, Records and Proceedings shall be proved, and the Effect thereof."