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...only when Federal law overrides State law (this should be obvious)

so in my example, there is no Federal carry reciprocity law, so states can clobber each other at will

likewise, there is no Federal Drivers License, so you get some states that share license info with each other, some that don't...and they aren't compelled

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Congress gets to decide what reciprocity states must have. Driver's Licenses are one of those. Every US state must accept every other US state's licenses.

Congress did not decide that concealed carry had reciprocity.

The entire "legalizing gay marriage" argument was if states had to be forced to accept same-sex marriages from other states where it was legal.

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