wireshark isn't a dynamic analysis tool

[Daniel Peters]

??? it doesn't have anything to do with reverse engineering? I mean, if i'm wrong on this I'd love to hear how one uses it for reversing! seriously!

[John Broadbent]

Wire-shark is commonly used for reverse engineering network protocols.

Sometimes analyzing raw traffic is the only way, and other times it is just a starting point.
See this lab as an example and see this project for USB reverse engineering.
Different people reverse engineer different things :)