B2 licenses were originally avionics, being instrument and radio, however electrical privileges were sensibly added later.
NM great response I think however your above statement may end up being a poisoned chalias as when EASA issued the licenses avionics got a restricted B1 giving them some chance of further training in their company in line with the mechanical guys. I have a suspicion this was a Qantas pushed change through CASA to evade this.