As a German living outside of Germany for 15 years I have an interesting perspective on this:

The rule-following in a work setting is all about risk mitigation and rules tend to help with that. Similarly for following established processes. I know this is pretty annoying but at least I'd argue the status of work is transparent and the outcome reliable (even if it may take a long time because too many hypotheticals were considered). The unstructured working style of the US can certainly drive a German a bit crazy at times :)

In a social setting rules are also enforced to ensure that you don't negatively impact the personal enjoyment of others. For example, no mowing your lawn on Sundays so everyone can enjoy a quiet peaceful day. No talking loudly at your table in a restaurant so you don't bother the other diners etc

Compared to the US I find Germans and French to be fairly similar with the difference being that French are more relaxed in attitude but definitely complain even more than Germans haha