It's easier to find people who are confident that they understand a microservice, but the fact is that it interacts with the system as a whole and much of that interaction is dark matter. It's unknown unknowns that lead to Dunning-Kruger. People looking at a large system have more known unknowns and are less likely to be overconfident to the same degree.

Also we need to have about 5x as many people graduating with formal classes in distributed computing as are now or have been for the last several decades and it's just ridiculous how many people have to learn this stuff on their own. Distributed debugging is really had when you don't understand the fundamental problems.