As an employee, the Arbeitgeberbrutto is a number you never see. You’re not saying that employing people isn’t worth it, you’re saying that working in Germany isn’t worth it. Then you have to take the employee’s perspective, not the employer’s. Nobody advertises the true cost to the employer in other countries either. How much do all those benefits to US employees cost? Do you include that when you list US salaries, or do those get magically excluded because health insurance isn’t mandatory?
Your premise just seems fundamentally flawed.