> You can live on benefits before becoming a citizen and after becoming a citizen
What benefits? I don't know every country in the world, in Germany unless you count retirement as a benefit (which is something you pay for and have to reach a certain age that is ever moving upwards) you don't get any assistance if you're not living in the country.
When was the last time you were called to personally appear and report to the German government, so that they could verify that you are in the country, and not somewhere else?
Benefits aren't collected in cash, they are sent to bank accounts. The beneficiary can be anywhere.