I keep going back and forth on hints. It seems weird that XIV is missing a lot of common assists—highlighting tile copies on mouseover, wait previews, furiten warnings that appear before you own yourself—but will still occasionally allow a Novice to queue up with absolutely no clue what's going on, match hints for 4 hands, and win. (This has happened to me more than once: not often enough that it's really worth getting upset over, but a room full of 3dans losing to a player who "queued for this on accident" is as funny as it is frustrating.)

Clubhouse Games has a really nice assist feature where it recommends yaku based on your current hand shape—it's kinda dumb and wants players to force honitsu a weird amount of the time, and even with polishing it'll probably never be perfect advice, but features like that are a better fit for XIV, IMO.