A new engineering guide to USB-C explores the immense complexities of the USB-PD protocol that frequently lead to poorly implemented power delivery in consumer hardware. To help debug these widespread issues, the author highlights an open-source USB-PD protocol analyzer designed to troubleshoot power negotiation and cable capabilities. While some readers criticized the guide for overlooking basic five-volt implementations, the community praised the debugging tool and noted the continued usefulness of affordable PD decoy boards for custom hardware projects.