Yeah, Republicans are somewhat more used than Democrats to having unqualified candidates (like Trump or Carson; this time around Yang fits), who have simply never held any office that qualifies them for the Presidency. The interesting thing about Buttigieg is that he's
underqualified -- he holds a position that would normally be seen as qualifying for the House, perhaps the Senate, but certainly not the Presidency.
I think the last person like this to run a credible major-party primary campaign was Alan Keyes in 2000.