An IT tech isn't going to want to enable developer mode on Joe User's iPhone just to find out why it can't get an IP or join the VPN. The device still has to be paired with a Mac (and on iOS 7, unlocked and the Trust button tapped) in order to activate pcap.
I was surprised Zdziarski made such a big deal over the packet capture tool. It's been documented in the referenced developer Q&A and in various blog posts[1] since iOS 5, and I've personally found it very useful for troubleshooting connectivity problems on enterprisey networks.