I doesn't explain moral going up by hitting your opponent, the idea of combos isn't explained, the help text isn't color coordinated so it's not instinctive that it's talking about the status effect it'll impose, and how weapons and Armour works. And that's just what I recall noticing when I was learning it. For example the first time I fought I was duel wielding and got confused by the two separate colors for slash.
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Basically the help text helps you with figuring it out through trail and error rather then fully explaining it. I personally liked discovering how it worked but some prefer or straight up need an idiot's guide to this type of stuff.
Also the airow mentioned in the posts above.