First of all, the hidden skill line and unlocking mechanic was one of the dumbest and most unnecessary changes ever made to this game.
Secondly, I made a new toon today and the unlocking seems to be bugged. Medium armor unlocked like it is supposed to, but light and heavy will not unlock. I tried logging in and out, I tried getting XP from various sources (monster kills, quest turn-ins, exploration, etc), and various combinations of dropped and crafted gear; but I can't get the skill lines unlocked.
Does anyone know a workaround for this bug? @ZOS_GinaBruno
maybe you have some intel?