Totally agree with you

The Hamburger they're referring to is a Hamburg steak, which is a grilled and gravy-topped plate version of Steak Tartar, a rare beef dish that's a French version of ... a Tartar chopped beef dish. It's all versions of something else and they change each time. The American change to grilling, buns, and a handheld version isn't any less than the German or French, IMHO

Same for "Frankfurters", they're pork, lamb intestine, boiled, and only served on a plate. But American hot dogs historically are kosher beef, spiced more heavily, are typically grilled, and absolutely are served on specialized buns developed for them.

This is typical for American food inventions, a rejection of any updates or improvements.