It's kind of touchy, giving trainee anything extra. It's a unique set, not a normal 5 piece set. Every other 5-piece set in the game gives you your first bonus when you equip 2 pieces, whereas Trainee gives you a bonus effect with a single piece of equipment. To make it a proper 5 piece set, it would need to get rid of that function, which is the only reason people really use it anyway.
It's kind of touchy, giving trainee anything extra. It's a unique set, not a normal 5 piece set. Every other 5-piece set in the game gives you your first bonus when you equip 2 pieces, whereas Trainee gives you a bonus effect with a single piece of equipment. To make it a proper 5 piece set, it would need to get rid of that function, which is the only reason people really use it anyway.