German Approach
In Germany to persuade is to inform persuasively. Persuasive argumentation guides an audience to its logical conclusion. Selling the conclusion is not necessary.
American Approach
In the U.S. to persuade is to sell persuasively. Persuasive argumentation leads the audience to a choice. The audience is asked to make a choice. The presenter asks the so-called closing question. Yes or No?
German View
Americans sell. There is little substance. They don't persuade. They put on a show. The audience has to either buy or reject. Germans feel very uncomforable with such a frontal approach.
American View
Germans inform only. They give academic lectures. They don't sell. The audience is left hanging. Perhaps they are afraid to ask the closing question. Americans don't buy if you don't ask them to.
Advice to Germans
Overcome your inhibition to recommend a clear choice (your choice) among the options. Ask for the order. The worst that can happen is you'll get a "no." Life will go on.
Advice to Americans
Do not confront your audience with the "buy"-question. Americans can easily come across as "pushy used-cars salesmen." Take almost a "take it or leave it" attitude.