The thing is, in interpreted languages land print debugging has a power no debugger gives you: live debugging on your production instance.

Something is broken in prod, you cannot reproduce it in your test environment because you think it may be due to a config (some signing keys maybe) you can't check. And it looks like someone forgot to put logs around whatever is the problem.

You can either: spend multiple hours trying to reproduce and maybe find the cause. Or take 5mn, bash into one of your nodes, add some logging live and have a result right now: either you have your culprit or your hunch is false.