As a side note, it'd be nice if melee could learn to do positional outside of dungeons.

The time spent in dungeon / trial is very minimal when you level your first job and this is where you get most of your habit.

Melee not being able to do positional on most world mobs makes newer player (who are slightly casual in mindset) get a very bad habit of ignoring those. It is not uncommon to see melee entirely ignoring position until max level when they start being told/réalising they perform poorly.