Do you have links for this? I think that discussion might have had more to do with the commerce clause thatn the privileges&immunities clause, but I'd be interested in seeing what they had to say.
You may be correct on that. Its all "intertwined", though. Without "uniform" laws governing behavior that does not violate rights, we could have very little "interstate commerce". That's why the feds have extorted away and usurped certain rights from the States - not to give them back to the rightful owners - the people, but to make their own rules. Its not right for either level of government to do so.