[Question] Why do most job titles have a much more extensive name than the actual job says

Good evening Reddit users, I live in Germany and have a question especially for the American users here. In documentary films or YouTube videos, I notice again and again that in America (or international, especially English-speaking companies), the job titles of the individual employees do not really have to do with the actual work in my point of view and are quite excessive. By this I mean that every second employee feels like „manager“ or „director“. Can you explain to me why this is the case or do I just have the wrong impression here? In Germany we have like for example in the supermarket chain Rewe a „Store Manager“ and then several „clerks“ (like normal employee).