While I was only speaking in hypotheticals about companies that only want to hire people who have legal status (no one has asked us to help them get TN status), I'd rather do zero paperwork by hiring people with existing status, than (allegedly) "not hard" work to support TN hopefuls, especially given the US government is liable these days to randomly change things around and cause chaos - especially in areas likely to score political points like immigration. POTUS could declare tomorrow that every TN (in a certain industry? state? whatever) has to go home in 10 days.

My attitude would certainly change though, if/when we can't find skilled people with existing work authorization, or if I had an incredibly strong personal referral.