John Allen "updated" this in 2017. I use scare quotes because battery powered angle grinders should have been part of the threat model then and Allen doesn't me

John Allen "updated" this in 2017. I use scare quotes because battery powered angle grinders should have been part of the threat model then and Allen doesn't mention them at all. This is important because now those fancy U-Locks are as easily defeated as a cable lock. U-Locks that resist angle grinders are a very recent development, but their usefulness is limited by the fact that the things people lock bikes to are still vulnerable to angle grinders.