...also don't confuse a film with a game, a film has to make some nod to reality, were anybody can put on a piece of armour. The game restricts armour to balance the classes
^This part is incomprehensible to me.
I wonder if what is really going on in SW IV is that classes have evolved since SWTOR. Remember, the films take place many years after the events in SWTOR.
So maybe this means that in a future expasion, e.g. when the level cap is raised, that smugglers can learn to put on heavy armor.
Doesn't explain why Luke only has one lightsaber and is still wearing what I would call medium armor, though. It's like he's level maybe 7-8ish whereas Han Solo is then level 51+.