Is it time to start calling out bad cyclists?

The advanced boxes are NOT enforceable.
They are enforceable, in the same way that normal stop lines are enforceable - but cameras are not set up to enforce them, and popo is often ignorant of how they are supposed to work.

They can variously be a good thing, or a bad thing, depending on location and prevailing traffic conditions.

They do seem to encourage cyclists to always try and get to the front of traffic though, which can't be a good thing.