It's also worth noting, that credit cards aren't too much of a concept in Europe at all. They do exist, but I remember them mostly being used for traveling and online payment (e.g. when the seller is international and PayPal isn't an option). I recall that before the latter was a thing, it was even rarer. My father (who traveled a lot for his job) had one, and it was "interesting".[1]
My parents also strictly taught me that "taking a credit is a very bad thing, you are spending money you don't have", so credit cards had a kind of "dangerous" aura just by their name. As an adult, I of course have no trouble using credit cards here in the US (I just pay them in full all the time), and I can easily calculate that it usually makes more sense to buy houses and sometimes even cars with a low interest credit, but I am glad to have received that lesson...
[1] Also taxis. Taxis were special there. Back then mobile data networks weren't a thing, so electronic payment options weren't really available for Taxis. However, credit cards had this "ratchet" thing that was entirely mechanic. Couple that with the fact that Taxis spent (and still spend) a lot of time at airports, it comes back to the "traveling" use case, but this time inbound. I have no proof, but I highly suspect that most local people paid Taxis in cash, as was (and maybe still is) much more common in Germany in general anyway.