The devs can start by improving the dummies. Instead of just a time limit, how about an isolated room (similar to the inn) where players can see the damage and skills used in succession displayed, similar to fighting games. You could even make it so that they can "save" 3min sessions up to two slots where the player can be shown comparisons as to why they did better or worse in one session and the other.

Hall of Novice needs a continuity in the form of hall of the seasoned or intermediate. Explain things like a giant yellow cursor does not mean its a bomb radius waiting to happen (as one sprout explained hilariously to me when he ran away with it) and is actually a stack marker to share damage. Maybe even throw hints that savage/ex content cannot be done with "casual" gameplay and that it would be best if the sprout spoke to veteran raiders for extra advice (maybe even point to popular raid centric lodestone blogs). The hall should initiate exercise that highlight the main assets of a job the player entered with and stress their importance.

I know YoshiP has this belief that the community should teache one another all the nitty gritty about the game but it's not a realistic view and I feel like putting resources into not just this suggestion but any that requests improvements for halls and battle log transparency could go a long way.