Thanks, that’s very helpful!
Do I get this right: the ETF you mentioned will rotate individual bonds as long as the ETF exists, while buying an individual Kassenobligation will have one single yield to maturity? So basically, buying a short term kassenobligation for money I need, say, in a year, would be a better investment than leaving it in cash in my bank account?
I totally agree with higher returns on stocks in the long run. Bonds will likely not become an issue for me until short before retirement.