Print debugging is invaluable for actually having any chance to understand what happened in a complex bug in production - especially if you're working on user-r

Print debugging is invaluable for actually having any chance to understand what happened in a complex bug in production - especially if you're working on user-run apps, not SaaS. Debuggers help immensely if you can reproduce the bug reliably and in relatively decent time, but if you can't logging/print debugging is your only hope, since no one is going to run their code in production with RR attached.