As an electronics guy, sometimes it is really reasuring to look what happens on the wire, because it bisects your problem space. E.g. I had a student once who

As an electronics guy, sometimes it is really reasuring to look what happens on the wire, because it bisects your problem space. E.g. I had a student once who was frantically trying everything on the raspberry pi to fix some motor control script he made. I suggested he should just write a minimum workable code first and then check if there is a signal on the wire. Turns out the wire was not connected. Especially with hairy problems looking at the actual signals can be useful. Granted, doing so for UDP/Ethernet frames might be overkill, but it is nice to see it can be done.