The expert grid has enough stats to always crit for 99999 and always evade every attack from every enemy in the game, and 9999 hp is sufficient to survive any attack with other stats maxed. Not needing to use break hp/mp limit auto abilities allows you to get other auto abilities that ultimately are just as good, or better. break MP limit is of course redundant because both yuna and lulu get one mp cost on their ultimate weapons anyway, allowing 999 casts for yuna and 499 for lulu due to her magic booster passive.
So, the expert grid is, as the name implies, for the true experts of the game.
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