We're comparing headline numbers, not economic cost. There are so many other economic costs to hiring someone that it would be almost impossible to compare. The most blaring one of course is healthcare cost. In the US, the employer bears this cost which is enormous (as healthcare is astronomically expensive in the US) and by your argument this would reduce "your likelihood of receiving a certain level of take-home pay"

And yet incomes are much higher in the US than in Germany.

I think headline numbers are the only useful thing to compare here.