I don't agree! It's easiest to printf() things since you don't have to have tooling to debug every language you want to work with!

Nothing is easier than setting a breakpoint in a line of code and running the app.

When a breakpoint is hit, you also have access to local variables and their state. Some debuggers even allow us to change variable values at runtime.

Using printf is effective, but far from being the best way to achieve anything.