That's a very smart way of debugging concurrency. I did a lot of logging as well when I was doing debugging concurrency. Overtime once you got familar with the projects, I started to develope instincts on how everything fits together. That's when reading code line by line, making educated gusses start to become viable way of debugging concurrency.

But for complex projects, reading code or relying on instincts may not work alone as brain power run out of capacity. That's why logging helps a lot