I think, before anybody gets too aggravated, that we should all calm down and remember two things. One: Hearts of Iron IV is more-or-less a sandbox game at this point, it's about trying every possibility and having fun. And two: nobody is going to put a gun to your head and FORCE you create any silly (and let's be honest, it IS silly) nations like the Holy Roman Empire. I welcome any new possibilities to make the game fun and increase its longevity - including allowing players to resurrect long-dead empires.
Because let's be real... it WOULD be fun to lead a 20th century HRE through World War II...