You can go without cash for a lot on Germany. Train tickets, groceries, cinema, restaurants, bars.. All of those and more work fine without cash (you need Maestro, but everyone has one of those).

It fails if you want to buy food in the streets maybe, not every Doner can be paid by card.

But.. that's normal and aligns with what I see here in Singapore now: Cashless, unless small food shop/hawker place or something similar.

Germany doesn't accept _credit cards_ on a large scale. It does support paying with a card made of plastic usually..