The tax thing I do get. Especially if you are not a migrant it can be a tough ask to give away 40-50% of your money, a lot of which goes directly or indirectly to pensioners who probably hate your guts. Though again, while this is particularly bad in Germany, it's hardly unique in that regard.
The weird low-tech bureaucracy (which culturally extends well into the business world and is related to things like high physical currency usage) is to me one of the worst parts of Germany. IMO the taxes are not bad because you get a lot of benefits from government spending living there, it’s the low wages that are the real problem.
During the pandemic, paying by debit card was encouraged, and this has stuck around.
I have used cash in a single instance in the last month (at a restaurant where the card reader was out of order).
However, it turns out that most people still prefer cash, so I might be living in a bubble, see https://www.bundesbank.de/en/press/press-releases/payment-be...