Pretty common in Germany are 30 days.

Yep. The minimum is 20 days (for a five day work week) but most people get 25 to 30 days. That's on top of 10-13 public holidays, and sick days.

Moreover, taking sick days is normalised and you will not be punished for it unless you abuse it. If you take below 30 sick days a year, you're likely safe.

My job is to help people settle in Germany. I struggle to communicate how chill German work culture is.

Switzerland is 25-30 (at a certain seniority).